How about Doug Collins and Doc Rivers?
Both were good players, without injury Doug might have made top shelf, but they didn’t really hit the top. I’m thinking about the Gretskys and Dr J’s and Emmitt Smiths. The ones that try coaching usually aren’t very good at it, lots of theories why, mine is that they can’t communicate with “regular” players who actually need motivational speeches and such. I always think about Jerry Rice, a guy who regularly came into training camp in better shape than the trainer’s goal for the END of camp, if he tried coaching he’d be on such a different plain from the normal players that actually need training camp I don’t think they’d even understand what he said.