Count the keys lines. A residency has a handover; a blank keys line at day 60 is glue, and seven of Mandic's 24 are holding one.
The survey, the two readings, and why the seven settle it are in Milos Mandic Can't Tell From 24 FDEs. Seven of Them Already Answered. The keys line itself is in Month Two: The FDE Leaves, the Workflow Has to Stay, and the three doors out of the seat are in The Career Out of the Seat: Draw the Exits, Not Just the Ladder.