hardly its point to joke on that kind of clandestine operations.
its SO usual, so almost 3/4 of middle east political/military leaders is replaced by agents in disguise/surgery. for example.
so Gavin can be victim of such attack. and not from only CIA. en-route.
So? We will know he's been replaced when the coding suddenly becomes very poor (or there are no new updates at all for weeks).
Or do you propose that they can not only replace Gavin with an agent but also transfer his "skillz" via some brain transfer interface?
why replicant/infiltrator/insurgent/mimic should/can/must/might produce "very poor" code ? agents usually can perform better than prototypes and trained for months, even years before insertion/replace.