Anyone else think its a bit strange we find out the gun has went missing , only someone with access to the gun ( fbi agent) could take it out. And then we discover Janis is a spy and possibly is involved in marks death. could i be her who has the gun ? could she tell Mark that Demetri is the spy and this could cause him to shoot him ( considering she was right about maya, he would take her advice) And then is the masked gun men in mark's flashforward could actually be members of the fbi or cia coming to kill him after discovering he killed an innocent fbi agent (Demetri), And who wouldn't start drinking after killing their best friend ? And when in Marshall's flashforward he says ' Mark Benford is dead' he would be afterall just doing his job ? Plus Janis would still have time to have her scan. My little theory.