Jets goal is to keep Glenn from leaving the building [Multiple HC & GM Candidates tells ESPN’s Cimini all indications point to Glenn]

I mean, I’m not sure if there is any truth to rlemieux’s claim or not but I have a hard to wondering why at that snapshot moment in time Glenn would actually believe the team would hire him over Allen.

At that moment, Glenn had just left his stint under Allen as our secondary coach and had just completed year 1 as a defensive coordinator for a 3-13-1 team with the 31st ranked defense in points allowed and 29th ranked defense in yards allowed.

If he thought it was a sham, he should have known that going in and shouldn’t have taken it. There was no way he was going to beat out Allen unless he completely blew our socks off.
There's the pluses of interview experience and getting your face in front of the team decision makers and building a strong impression, ready for when the opportunity next arises (which it has).