I don't mind the fact that Rey may be better in pvp,if Kylo is better in pve or the other way around,thing is the Kylo kit still leave some unanswered questions(altleast for me).How does Siphon abilitywork in pve,can he build stats over the course of the battle,i remember an ability states that he will get some mastery(thats unclear),because if those abilitys will not work in raid he will not be that impresive at all(and something tells me it would't work).
Siphon: This unit will gain 1% of a stat per stack and the target will lose the amount gained.
I'm not thinking that the boss will loose the stat but i sure hope kylo will get a certain stat value.