No comment re: the one or two White House evacuations, then, Senenmut? Okay, let's move on.
Apart from the supposed 9:26 evacuation (which, even if it were true, contradicts Mineta's story), the main other piece of evidence you've presented to support Mineta's timeline is Belger's statement, and in particular this quote:
But of course this doesn't really support Mineta at all. Here Belger says that he "got on the phone" with Mineta after the Pentagon crash. Mineta's story is that he was talking to Belger long before then, and in fact it was Belger who told him about the approaching plane.
You will want to look for excuses, of course, and I guess in this case you'll say that Belger "getting on to the phone" after the crash, doesn't mean he wasn't talking to Mineta beforehand. It would be an odd omission, but that's at least possible.
However, fortunately Belger makes things more explicit in this interview (my emphasis):
So, in one interview Belger only mentions getting on the phone to Mineta after AAL 77 hit; in the other, he says he doesn't recall speaking with Mineta about the approaching "high speed VFR".
And so, once again, something that's supposed to support Mineta actually contradicts a key part of his timeline.