My Weekly Questions About "Heroes"...

So I did manage to catch “Heroes” yesterday, and as usual, I have a few questions…

Peter causes the explosion because he can’t control Sylar’s powers? So how did him saving the cheerleader save the world? And how did Nathan get to Texas so quickly?

Who is the person giving HRG orders? Is it Linderman?

And what is up with Hiro and that dragon?

Thoughts?