As for his history, ask yourself why a so-called poor boy would spend money to make an unexplained trip to Pakistan? What passport did he travel under? What did he do there? Attend a terrorist training camp? If he were an agent of a foreign government, the KGB for instance, he would be financed, he would have a "history" created for him on paper in colleges, but no one would remember him, because he was never there.
At this point, even implausible explanations are beginning to appear possible.
“What passport did he travel under?”
Perhaps, he used his US Passport.