Question about Royal Guard's health pool calculation at start of battle under Lord Vader

Just test it using Hermit Yoda's heal.
It will tell you exactly what both of their Healths are at during the battle and then you can calculate it backwards.

The way I understand it, the order should go,

1 - LV gains 10% Health & Protection per relic level
2 - LV converts his Protection into Health,
3 - RG takes 5% of LV's new Health
4 - RG doubles his Health
5 - RG gains +40% Mastery & +30% Health
6 - RG converts Protection into Health