This thread is assuming that the people reading it have completed at least most of the PC game. I'm not stopping anyone, but please keep in mind that there will be spoilers and such.
By "power", I mean character H-scenes. How can Rin have H-scenes in all three routes and her own route, Unlimited Blade Works, and survive all 3 routes, while Illya has none and neither, not to mention getting killed off in 2/3 routes? How can such an injustice happen? I mean, Shiki Tohno had sex with Len in Kagetsu Tohya! Illya's legal, too (though she doesn't look it)!