andy luttman : too meek and scientifically introspective , not ambitious or concerned enough with rivalry to make a play ; john page ditto , except that he carried a flame for kirsten and so that might have pushed him over the edge into action ; mithil senadhira , too nice and too new still trying hard to ingratiate himself and be everyones friend to risk getting involved with department political battles ; russ hebbard himself , a strong possibility he was certainly sharp and ambitious enough and a crafty double-play like this might appeal to him ; kirsten bremner , the other main suspect , except for the phraseology of that first e-mail .