In seeing the recent set picks of Hiro and Sylar in Odessa, it looks like Hiro is going back to homecoming to try and kill/stop Sylar from attacking Claire. I was thinking that it would make sense that he would also go back in time to stop Arthur from taking his ability, if he does this maybe he can save himself as his illness seems to stem from getting his powers back from baby Matt. And maybe while in Odessa in the past, he warns Peter about his father stripping his abilities. This might be how Peter gets his powers back or some version of it to keep multiple abilities?