Guys, when I said orks are powerful psykers, I was talking about their inate, uncontrollable power to make things happen by believing it should. Because that is a psychic ability. Hence they are powerful psykers, who can't control it...
Devotion as I think should work like this: Adeptus Astartes choose a Primarch or The Emperor(tactical), to choose class alignment, Legionnes Astartes choose a Chaos God or Chaos Undivided(tactical), Orks choose between Gork or Mork, or a famous Warboss(like Gorgutz(taktikal ork)), Eldar devote themselves to the Aspect Temple or any of their Gods(Dire Avenger).
Wyrd Boyz are powerful! It isn't so much as saying a tree is a power plant, more like... If you built a nuclear power plant using gum, duct tape and toothpicks.
You have no idea what you're talking about human. Excuse me for putting words into your mouth but what you wanted to say is "Thanks to the Dark Eldar lust for lust". We no longer see them as one of our own.