Some coaches are just better suited as coordinators, vs being HCs.
If they can focus on just one area, of their specialty and expertise, they can manage to focus, plan, scheme a certain area
and unit rather than as a HC, having to oversees his entire team in all phases and areas of the game, that's offense, defense and special teams.
A HC oversees his entire team in all phases and areas of the game, that's offense, defense and special teams.
Bu they dunno how/when to delegate and duties to their coordinators, and when to step in themselves and take over
the duties or enforce strong suggestions.
There's a difference between Andy Reid, Sean McVey, Kyle Shanahan, Mike Tomlin , ... vs the Norv Turners,.. Josh Daniels,.. Steve Spagnuolo,.. Jim Swartz,