The Mighty Monkey of Mim wrote:
He's in the burning building because he planned the whole thing.
Oh, wait. Yes, that's an obvious thing I missed!
The dental records were switched, but House couldn't have done that after
his apparent death because he would have run a risk of being caught.
See, I was thinking that House lucked into a situation where he could walk away from his life and start fresh, but in reality it's clear that House set up the whole situation.