: Not to mention there are subtle hints that Lasky was already in contact with
: Halsey and knew Chief could very well become a liability. So not really a
: "oh, he's not my hero anymore", but a "mom told me
: ebil-Cortana can possibly turn him on us, better be safe than sorry".

That is the impression I got, too, although maybe they didn't make that clear enough. It wasn't "Bring the Master Chief in at all costs because he's rogue," but rather, "Bring him in because he might not understand what Cortana is now, and she can't be trusted."