I have 90 Duncan. I have also another 8 90ovr and coach boost..
I have Westbrook, Curry, jokic capella Duncan Gordon Tatum Kawi olapido and Cj.
Propably someone between CJ Gordon and Capella is a very weak 90...
Wow, what a franchise man. Congrats! Maybe try experimenting your coach and if you have other 90 players do the switching on those as well. Sometimes even gold coach can make the level up if it matches the players stats that will be boosted (ex most of your player have high passing accuracy, putting a coach with high steal boost will not make your team level up but a coach with PA boost). This is my theory only though, so goodluck!
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