If I may add my opinion, those theories are completely nonsence.
If Mr. Hitler had escaped from the bunker, who was that half burned man in the garden? All those investigations tells that body was Hitlers.
Hitler told his officers who tried to talk him out of Berlin, many times, over and over that he will share the destiny with Germany.
There are many many interviews with former officers and workers who were in bunker that Mr and Mrs Hitler will be burned after suicide whitch was a final wish for them.

Yep, this is "what if"