I am one of those guys who could do a fake signature with 5 minutes of practice. Would I ever do it? Hell no. However, I sometimes "autograph" looseleaf, and scrap paper when I am bored.
On the current topic, I'd say they're fake. Some of them look almost perfect, but IMO, the Yzerman, Brodeur, and Luongo are off quite a bit. If he has three fakes, I think that's enough to say they're mostly fake.