Board Thread:False Info and Speculative Discussion/@comment-24458290-20140610131129/@comment-13965604-20140619144928

I 2nd the position that it would be cheesy and unnecessary. Besides, except for Peter, they all looked more Native American than Greek to me. And even Peter isn't outside of the realm of possibility for Native American ancestry, I know blondes that are in the local tribe.

But to the OP's point, I think it isn't Peter specific. The turning into other creatures/very powerful creatures seems to be more about the who got changed not who did the biting. And for all we know at this point the Kate thing might have to do with her being clawed instead of bitten. As for Peter's form, his mind was twisted and warped, bent on revenge. Or so they tell us after the fact. It's really just a budgeting thing.