Is Peter Petrelli the Hero Killer?

It's starting to seem possible that Peter Petrelli is the hooded Heroes killer now. On this past week's show Peter received that note from "Adam". It just might be the same guy (Adam Monroe) that Bob told Suresh was dangerous to the Company...hmmm...Maybe Adam meets Peter in the future we saw and convinces Peter he needs to kill the Company and all its associates back in "present day"? Not too far fetched...Then again, maybe this Adam guy is the killer because as we saw in Painting 7 of 8, it didn't quite look like anyone we've seen yet, and this guy doesn't like The Company, hence he is HRG's killer..

When coming up with suspects, it seems to be best to consider the following:

1) The build of the hooded figure we were shown is sort of slender, which is like Peter, Nathan, West, maybe Takezo or even West. If the Petrelli dad is still alive he may be a possibility too.

2) Motives - Who wants these people dead? Someone committing crimes of passion or revenge? Is it someone they tracked, or someone whose life they have really messed up? Or someone trying to save the future from the Company? Or someone who used to work with or for them who now wants to destroy them?

3) Powers they might need - Judging from how Kaito was killed, the killer either can fly and/or regenerate/heal. They may be able to turn invisible (based on the Angela Petrelli attack). I'd go one step further and add teleportation to that list, because we saw Hiro teleport himself out of harm's way before hitting a building (when Sylar threw him towards it). Thinking of it like this, Peter has every one of these mentioned abilities.

Peter makes a prime suspect under all 3 of these above criteria. He has a similar figure to the hooded individual. He also has more than one motive with the whole "blow up NY plot" using him as the bomb, or possibly learning something in 2008 that leads him to want to kill off the elders. Suffering a serious case of amnesia, he could easily be teleporting away to perform killings or attacks. And he definitely has enough powers to achieve these murders and the Angela Petrelli attack. While he's a big fan favorite on this show, it seems premature to rule out any one of the characters as suspects right now, especially on a show about superheroes.