Yeah, Eden was annoying. Did her bit to try and redeem herself, but still stupid.

Sylar obviously didn't keep his ruse up long, since he doesn't have any other powers than the ones we saw him steal. Knowing Mohinder, it would have played exactly the way you said. I bet Zane Taylor was like super famous and shit and his death was all over the news such that Mohinder couldn't help but stumble over it 'cause otherwise I don't buy that he would ever have figured out Sylar for the killer on his own.