Someone had mentioned he was on the DL list 3 months, which is the amount of time they were holding guys back before being allowed to actually flow. I'm willing to give the guy the benefit of the doubt until unequivocally proven otherwise.

A senior sim instructor making a decent living with enough seniority to have solid control of his schedule would have plenty of reasons to decide not to take a flow to be junior for a few years, potentially commuting and unable to hold any weekends off.