Earlier in the thread a link was posted to a newsletter published by a Navy retirees association. In the newsletter Ahmed was listed as a MACM. The publishers of the newsletter have a vested interest in knowing who the new inductees to their organization are. Also, it's quite a stretch to believe that Ahmed would lie about his rank to get into a retirees association. What would be the point? As you know very well, in the military it's very much a part of the culture for everyone to know everyone else's rank. For all practical purposes it is impossible to carry off a fraud about rank among fellow soldiers or sailors.
The SEAL story could possibly be fraudulent, but given this guy's history as a responsible individual (MACM, Imam (preacher) at a mosque), I think it's wise, at least until his birth name is uncovered, to give him the benefit of the doubt.