There was one good reason to suspect a trick. Since the end of the story is getting nigh, it seems appropriate that Stanley should either die or return to Gobwin Knob. Having him settle at Faq seems anti-climactic, but having him die at this moment would end Parson's plan unsatisfactorily. Perhaps Stanley will die after virtually all of Parson's plan is complete, but there is still the issue of what to do about Charlie. It seems doubtful that Parson can resist the mercenary Overlord after grinding his forces down against Ansom unless he gets the Tool's air force back home.
Looking for a way to make that happen, some of us seized upon a possible Jack Snipe trick.