Well, my friends think I'm wrong, but I think it's an interesting idea. What if Adam's power is just like Peter's? He can absorb powers. My logic goes a bit like this...
1) We know there are multiple absorbers since Claude already hinted at this to Peter in Season one.
2) Adam is obviously a really important/powerful figure at the top of some unknown group; being able to absorb others' powers would make him dominant as they are portraying him to be.
3) Adam has multiple powers or it was hinted to at least. He obviously can regenerate and Bob tells them about the Snow in Miami/Could have been a Tsunami which made me think that Adam can also control weather (like Storm from X-Men).
4) If the above are true, it is plausible that in Adam's grand scheme of things, he went back in time using the same powers as Hiro and posed as Kensei to throw off Hiro or something like that. He would not have necessarily had to absorb from Hiro as perhaps Hiro's father has the same power. Same goes for the regeneration.
Just want to see what other people think. =)
