Found this: http://www.factcheck.org/article.aspx?docID=203
It appears that this claim can not be substantiated in any real way. I can't find any solid rebuttal of the claim that this is simply mistaken identitiy.
Any evidence would have to be AFTER the July 2004 9/11 commision report... which states as you quoted.
I don't think it is a coincidence that those who seem to be the least interested in whether their claims are actually true are also those who relentlessly advance the position of the Administration - even when it is not consistent with conservatism.