<p>Osama bin Laden's mystery mate, delighting with the al Qaeda mastermind on the vile video, has been ID'd as a Saudi professor.</p>
<p>December 15, 2001 -- WASHINGTON - U.S. officials are looking into whether the mystery dinner-guest sheik who lavishly praises Osama bin Laden in the notorious video might have recruited some of the Sept. 11 hijackers, a source said last night.</p>