The big problem with Bounty Hunters right now is cleansing/Ten up yet for bounty hunters. They rely way to much on debuffs right now. They need a good new toon to allow all this stuff to stick and they could be good really fast. Dengar specifically is very underrated toon, with a small rework and maybe a zeta he could be very good suddenly if these debuffs are allowed to stuck better. I for one cannot wait for the bounty hunter rework. Mine are not were I want them to be but working them there as they are still my favorite toons.
Dengar might be good to increase damage or chance to call ally to assist if they are a bounty hunter.
Zam to allow grenades to always stick and cannot be cleansed.
IG 88, up the % chance of debuffs, they have been doing that with some reworks.
I would like Hondo added as well, but hard to argue he is a bounty hunter over just a scoundrel.