And I can reply with the old answer: Naruto uses Kurama's power. And so we can keep going on. Sasuke developed various forms of Chidori without much guidance of Orochimaru.Whether it was forced apon him or not it's not his power that's Orochimaru's tech if he didn't have it he would lost alot of battles Orochimaru was the one who held his hand though them. EMS is free you do absoutly nothing to get it but just take someone's own power.
And of course it's easy to take someone else's power. It's easy to at first feel the emotion of seeing one of your loved one's die and then when your vision deteriorates, leaving you practically blind and helpless, taking the eyes of a sibling. Of course, nothing hard about it.
Seriously I don't see the point of debating about this issue. It has been debated over many times before and it always ends the same way: a few admit that both got help and then you have the majority who refuse to admit some aspects about the other character.