Whenever this or equivalent topics come up flight crew seem to disengage brain and drop into "we don't need any weapon as we can be the weapon" mode.
Good for you - most people know that - really.
Is it possible to state that the bod passing through security in uniform with airline id isn't someone who has 'converted' or simply someone whose uniform/creds have been 'borrowed' when resting?
(The imposter/convert doesn't have to be part of the target flight crew s/he simply has to meet an accomplice passenger after getting the 'easy' route through security.)
Bring on cavity search for flight crew?