Aren't you kind of... leaping to conclusions? I still have no idea what's going on, but I don't think it's THAT. Yuuko clearly had powers BEFORE she met Clow, otherwise they probably would not have become associates. Yuuko being his "creation" or being "powerful because of him" doesn't make sense at all.

And as for women having their bodies manipulated to stay alive, uh, you're acting like that hasn't happened to several males in the work as well. Yasha and "Fay" easily spring to mind (HOW long did Yuui hang onto his CORPSE!?), besides Kyle also being a creation of Fei Wang's. And then there's the mess that is Watanuki...