Comment by just_once

Bill Russell, Boston Celtics, NBA national champions 2 years in a row, 67-68, 68-69 (first black head coach in NBA)

Most of the high profile basketball players you can think of do this - obvious ones are Michael Jordan, Kobe Bryant, and Lebron James - as I remember it Lebron has even written up plays from time to time during critical games (evidence: https://www.youtube.com/watch?v=uUkQbGQTdQ8, and famously erasing his coach's play: https://www.cbssports.com/nba/news/lebron-james-changed-fina...)

There are definitely a tiny handful, which absolutely makes them the exceptions that prove the rule, and a terrible idea for Coinbase or anyone else.

Gianluca Vialli won UEFA Cup Winners' Cup with Chelsea as player-coach in 1998

Reggie Dunlop, Charlestown Cheifs, they won the Federal League and it's hard to argue it wasn't all down to his coaching.

There's successful actor-directors.

George Halas - Chicago Bears

Kenny Dalglish, Liverpool FC, 1985-1990.

Pete Rose baseball?