If the show wasn't so far along now, I'd fire Welling and hire someone willing to play the damned role.
I can just imagine Zachary Quinto showing up in JJ's office, refusing to wear the pointed ears because it'll jeopardise his career. Oh, no, wait, I can't because Quinto is a professional.
Quinto is a crappy actor, as is nearly everyone on Heroes. Even when it was ok the acting on that show was god-awful. Now thjat the show has turned to pretty much crap it's even more noticeable.