You want every slot to do something it can’t do better elsewhere, but still be able to step in when the board shifts. Treat each person as a specialist pawn that can be promoted when needed, and give them a second, adjacent skill so they’re not stuck in a single line. Keep the overlap tight—no two people should be the same in the same spot, otherwise you’re just wasting moves. That’s the trade‑off: a tight core of deep expertise, with a flexible layer ready to cover gaps.