After Replacing SG-1, mini!Jack returns to the SGC.  Everything has changed.  Basically, things are shitty.  People aren't there because they want to be there, they're only there because they believe in the mission.  And the Legends going on halfway creep him out because even though they're true, the *way* they're said...People are smart enough to realize who he is, although they don't say anything out loud, and he keeps getting these tiny presents--stuff slipped into his locker, the last piece of pie, whatever.