@Viancee_IlI
I had some time and read your theory several times.
I think there are 3 skin differences during the calculations.
default inventory screen:
self-loading rifle: 129 skins
smg: 87 skins
lmg: 129 skins
rifle: 143 skins
shotgun: 59 skins
sidearm: 175 skins
vehicle: 83 skin
129 + 87 + 129 + 143 + 59 + 175 + 83 = 805 skins (slot) visible on inventory screen by default
inventory screen with all skins:
self-loading rifle: 137 skins
smg: 92 skins
lmg: 137 skins
rifle: 151 skins
shotgun: 62 skins
sidearm: 178 skins
vehicle: 89 skin
137 + 92 + 137 + 151 + 62 + 178 + 89 = 846 skins visible on inventory screen with all skins
all 846 skins - 805 skins (slot) visible on inventory screen by default = 41 skins not visible on inventory screen by default
ultimate revision battlepack (special, distinguished or legendary)
potential (1 item): 15 skins + 750 other possible skin = 765 special, distinguished or legendary skins drop from battlepacks
enhanced ultimate revision battlepack (distinguished or legendary)
potential (1 item): 15 skins + 378 other possible skin = 393 distinguished or legendary skins drop from battlepacks
superior ultimate revision battlepack (legendary)
potential (1 item): 15 skins + 118 other possible skin = 133 legendary skins drop from battlepacks
special skins drop from battlepacks= 765 special, distinguished or legendary skins drop from battlepacks - 393 distinguished or legendary skins drop from battlepacks = 765 - 393= 372 special skins drop from battlepacks
distinguished skins drop from battlepacks= 393 distinguished or legendary skins drop from battlepacks - 133 legendary skins drop from battlepacks = 260 distinguished skins drop from battlepacks
805 skins (slot) visible on inventory screen by default - 765 skins drop from battlepacks = 40 skins (slot) visible on inventory screen by default, but not drop from battlepacks
self-loading rifle (129 skins (slot) visible on inventory screen by default vs all 137 skins)
difference 8 self-loading rifle skins (slot), not visible on inventory screen by default and not drop from battlepacks: The Kirkpatrick skin for Cei-Rigotti (Battlefest reward), La Bizzarrìa skin for Cei-Rigotti (Road to Battlefield V reward), Blutigen April skin for Selbstlader M1916 (Road to Battlefield V reward), Odin skin for Selbstlader M1916 (Road to Battlefield V reward), The Old Drum skin for M1907 SL (Road to Battlefield V reward), Ah Tabai skin for Mondragón (Road to Battlefield V reward), The Arneson skin for Autoloading 8 (Road to Battlefield V reward), Das Jagdschloss Rominten skin for Selbstlader 1906 (Road to Battlefield V reward)
10 self-loading rifle skins (slots) visible on inventory screen by default, but not drop from battlepacks: The Dead Kings skin for Howell Automatic (APOC), Flora Sandes skin for Howell Automatic (APOC), Noyelles-sur-Mer skin for General Liu Rifle (TSAR), Auby-les-Hesdin skin for General Liu Rifle (TSAR), Oituz skin for Fedorov Avtomat (TSAR), Marasti skin for Fedorov Avtomat (TSAR), Chanson de Craonne skin for RSC 1917 (TSNP), De Scévola skin for RSC 1917 (TSNP), Testament of Youth skin for Farquhar-Hill (TIDE), Tondern Raid skin for Farquhar-Hill (TIDE)
smg (87 skins (slot) visible on inventory screen by default vs all 92 skins)
difference 5 smg skins (slot), not visible on inventory screen by default and not drop from battlepacks: Der Weimaraner skin for MP18 (Road to Battlefield V reward), The Hutier skin for MP18 (Battlefest reward), Siegfriedstellung skin for MP18 (Road to Battlefield V reward), Il Bracco skin for Automatico M1918 (Road to Battlefield V reward), Die Tiroler Bracke skin for Hellriegel 1915 (Road to Battlefield V reward)
10 smg skins (slot) visible on inventory screen by default, but not drop from battlepacks: Le Chat Noir skin for RSC SMG (APOC), Loup Garou skin for RSC SMG (APOC), Forain skin Ribeyrolles 1918 (TSNP), Felixmüller skin for SMG 08/18 (TSAR), Bakhmach skin for SMG 08/18 (TSAR), Schoenberg skin for Maschinenpistole M1912/P.16 (TIDE), Billy Mitchell skin for Annihilator, Over There skin for Annihilator, Toward the Flame skin for Annihilator, Stramm skin for M1917 Trench Carbine (TIDE),
lmg (129 skins (slot) visible on inventory screen by default vs all 137 skins)
difference 8 lmg skins (slot), not visible on inventory screen by default, and not drop from battlepacks: The Blood Tub skin for Lewis Gun (Road to Battlefield V reward), The Golden Retriever skin for Lewis Gun (Road to Battlefield V reward), The Yells skin for Lewis Gun (Battlefest reward), La Grand Griffon skin for M1909 Benét-Mercié (Road to Battlefield V reward), The Atterdag skin for Madsen MG (Road to Battlefield V reward), Die Deutsche Dogge skin for MG15 n.A (Road to Battlefield V reward), The Boykin Spaniel skin for BAR M1918 (Road to Battlefield V reward), The Canadian Cur skin for Huot Automatic (Road to Battlefield V reward)
10 lmg skins (slot) visible on inventory screen by default, but not drop from battlepacks: Calligrammes skin for Chauchat (TSNP), Ma p'tite Mimi skin for Chauchat (TSNP), Monte Ortigara skin for Perino Model 1908 (TSAR), Pozzuolo skin for Perino Model 1908 (TSAR), Der Sturm skin for lMG 08/18 (APOC), Franz Marc skin for lMG 08/18 (APOC), Paul Klee skin for Parabellum MG14/17 (TSAR), Otto Dix skin for Parabellum MG14/17 (TSAR), Rendezvous skin for M1917 MG (TIDE), Amos Wilder skin for M1917 MG (TIDE),
rifle (143 skins (slot) visible on inventory screen by default vs all 151 skins)
difference 8 rifle skins (slot), not visible on inventory screen by default and not drop from battlepacks: The Corbett skin for SMLE MKIII (Road to Battlefield V reward), The Pegahmagabow skin for MLE MKIII (Battlefest reward), Die Wilde Jagd skin for Gewehr 98 (Road to Battlefield V reward), The Teddy skin for Russian 1895 (Road to Battlefield V reward), Die Kaiserin Elizabeth skin for Gewehr M.95 (Road to Battlefield V reward), Osterschlacht skin for Gewehr M.95 (Road to Battlefield V reward), The Eisenhower skin for M1903 (Road to Battlefield V reward), The Bloodhound skin for Martini-Henry (Road to Battlefield V reward)
10 rifle skins (slot) visible on inventory screen by default, but not drop from battlepacks: Poperinghe skin for Ross MkIII (APOC), Wakamiya skin for Type 38 Arisaka (TIDE), Company K skin for M1917 Enfield (APOC), De Chirico skin for Carcano M91 (TIDE), Crna Bend skin for Vetterli-Vitali M1870/87 (TSAR), Doberdò skin for Vetterli-Vitali M1870/87 (TSAR), Cobadin skin for Mosin-Nagant M91 (TSAR), Monastir skin for Mosin-Nagant M91 (TSAR), Le Grand Cheval skin for Lebel Model 1886 (TSNP), La Madelon skin for Lebel Model 1886 (TSNP)
shotgun (59 skins (slot) visible on inventory screen by default vs all 62 skins)
difference 3 shotgun skins (slot), not visible on inventory screen by default and not drop from battlepacks: The Cleveland skin for Model 10-A (Road to Battlefield V reward), The Washington skin for M97 Trench Gun (Road to Battlefield V reward), The Truman skin for 12g Automatic
3 shotgun skins (slot) visible on inventory screen by default, but not drop from battlepacks: Thord-Grey skin for Sjögren Inertial (TSNP), Fismes skin for Model 1900 (TSAR), Fismette skin for Model 1900 (TSAR)
sidearm (175 skins (slot) visible on inventory screen by default vs all 178 skins)
difference 3 sidearm skins (slot), not visible on inventory screen by default and not drop from battlepacks: The Incarcerator skin for M1911 ("Road to Battlefield 1" Mission reward), Package from Home skin for M1911 ("Play to Give 2017" Mission reward), Holiday Package skin for No. 3 Revolver ("Holiday Mission #4 2017" reward)
vehicle (default 83 skins (slot) vs all 89 skins)
difference 6 vehicle skins (slot), not visible on inventory screen by default, but drop from battlepacks (6 skins): Black Shark skin for Destroyer, Checker Dazzle skin for Destroyer, Stripe Dazzle skin for Destroyer, HMA No. 3 skin for Airship, HMA No. 8 skin for Airship, HMA No. 16 skin for skin for Airship
8 self-loading rifle skins (slot), not visible on inventory screen by default and not drop from battlepacks +
10 self-loading rifle skins (slots) visible on inventory screen by default, but not drop from battlepacks +
5 smg skins (slot), not visible on inventory screen by default and not drop from battlepack +
10 smg skins (slot) visible on inventory screen by default, but not drop from battlepacks +
8 lmg skins (slot), not visible on inventory screen by default, and not drop from battlepacks +
10 lmg skins (slot) visible on inventory screen by default, but not drop from battlepacks +
8 rifle skins (slot), not visible on inventory screen by default and not drop from battlepacks +
10 rifle skins (slot) visible on inventory screen by default, but not drop from battlepacks +
3 shotgun skins (slot), not visible on inventory screen by default and not drop from battlepacks +
3 shotgun skins (slot) visible on inventory screen by default, but not drop from battlepacks +
3 sidearm skins (slot), not visible on inventory screen by default and not drop from battlepacks
= total 78 skins not drop from battlepacks
10 self-loading rifle skins (slots) visible on inventory screen by default, but not drop from battlepacks +
10 smg skins (slot) visible on inventory screen by default, but not drop from battlepacks +
10 lmg skins (slot) visible on inventory screen by default, but not drop from battlepacks +
10 rifle skins (slot) visible on inventory screen by default, but not drop from battlepacks +
3 shotgun skins (slot) visible on inventory screen by default, but not drop from battlepacks
= total 43 (slot) visible on inventory screen by default, but not drop from battlepacks NOT EQUAL 40 skins (slot) visible on inventory screen by default, but not drop from battlepacks (see above)
78 skins not drop from battlepacks + 765 skins drop from battlepacks = 843 skins NOT EQUAL 846 skins visible on inventory screen with all skins (see above)