I think we've all met wrestlers who have great credentials who are terrible coaches--can't explain anything, can't motivate anyone, no concept of organization, think that everyone should just be able to do what they do/did without being taught, cannot relate to anyone not like themselves. How many NFL, NBA, or MLB coaches were superstars in their respective sports? (And I know, wrestling is different, but the general concept I think remains consistent.) The greatest coaches I worked with were not World or Olympic champs, some not even national champs.
Team sports have schemes. A lot of the best position coaches dealing with individual techniques were good competitor's in those sports. And even with that Phil Jackson, Steve Kerr, Tony La Russa and Joe Torre all played at the highest level.
The NFL/NBA and MLB are all revenue sports. The athletes are making good money from competing so when they are done competing they can retire or have the capital to persue opportunities outside of coaching their sport so they have less top level competitor's trying to coach.
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