a lot of players think by being good or having a name in the nba can stir or do a coaching job!
i mean they can be good coaches but usually its not!
it depends on how much basketball IQ they have! a coach isnt just about shouting of calling plays but you have to be fast and quick witted in deciding what plays to call down the stretch of a game.
knowing which players to play, given the talent you have against another team. especially on a weaker note. remember you dont get much glory as a coach compare as a player.
its hard work, analyzing plays, building plays , what training to do for players which the assistant coaches will do!, number of hours watching games on recorded video. etc!