I always hear some old timers talk about how good Jim Zorn was with the Seahawks. He wasn’t a very good HC though.
in the NBA and college hoops, I’m starting to see more of the guys I know about and grew up watching that were good get head coaching jobs — Steve Nash, Kidd, Stack, Juwon Howard, etc
in the NFL the best guy I probably saw who is now a HC would have to be Mike Vrabel. I did see Kingsbury play against Rivers at NCSU in person but Kingsbury is probably dead man walking as a head coach.