Why is Heroes so awesome? Warning-Spoilers!

[SzczerbiakManiac]

Here are the questions I had after the finale:

• Why did Nathan have to fly Peter up into the sky? Peter can fly.
  (okay, this one has been reasonably answered in this thread)
• What happened to Nathan that caused him to grow a pair and decide to save his brother?
• Why the HELL didn't they make sure Silar was dead?
• If Parkman was taken away by ambulance, why wasn't Silar's body too?
• If Silar's body was already gone by the time the ambulance arrived, how did they at least not notice the HUGE blood smear leading to the sewer?
• What was that thing crawling down the edge of the sewer cap? It looked like a slug to me.
• Does mother Petrelli have a power? Is it the ability to bend people (or her sons) to her will?
• Who is the super bogeyman who can see Molly when she thinks about him? Have we already seen this character or is it forthcoming?
• Did the Petrelli boys really die?
• Why did Hiro end up so far in the past? He's gotten pretty good with his powers, that seems like pretty poor teleport.