Well angela's powers have been revealed I am more interested myself in the shift I can see coming in the series. I am of the opinion that nathan is the same as peter and his father only this has been laid dormant for some reason, I believe this due to the fact that maury is in his head not linderman meaning linderman didnt heal him as he believed. He had to have either healed himself or got healed by someone else.
Problem with this theory though is the fact he can fly, Nathan being the source himself of this power for peter. Only way I can factor this in, Is to be honest one of two things
1. At some point in his past he encountered west(that guy that could fly was in like 2 episodes) and sub consciously absorbed this ability
2. His power is in fact much more interesting than just being similiar to peters, his power is in fact not only being able to mimick abilities he encounters but to sub consciously develop ones of his own this in turn would make him perhaps the most powerful but the crux and interesting thing is that he isnt half aware of it nor his kin who thought he was a dud.
Nathan is interesting because although you see he wants to be a good person, and the audience want to believe it well I do. You just dont completely trust him due to events shown to you in the future and events with linderman this is shrewd manipulation of the audience which I most commend the creators for and perhaps make him a very interesting character IMO. The short of it I think he will come to the forefront as time goes on and it is him that becomes the main protanganist, or antagonist therefore shifting the emphasize from sylar and peter and doing so in a shocking and bomb dropping way.
The manipulated becomes the prime mover....The puppet master.