Well, powers are powers. No argument there. I think the real issue/difference here is what those powers represent. In the real world, there are ethical issues surrounding gene therapy (hopefully a reality someday, though basically a pipe-dream today). Let's say someone has a lung disease like...
HE didn't "turn Togue's head metal". He touched her so she could absorb some of his mutant ability and SHE turned her own head metal. That's how her powers work. As for why is she training if she has "no powers to speak of". As I said above, her power is that she can effectively have and use...