Jimmy Butler has aggressively challenged Brett Brown on his role in the offense, according to sources.
Butler has been vocal in his contesting of Brown and his system, including a recent film session in Portland that some witnesses considered "disrespectful" and beyond normal player-coach discourse.
Brown has said he had no issues with the exchange.
There has been some concern over Butler's long-term viability and fit with the 76ers.
Brown remains a popular figure within ownership and management while Butler will enter free agency this offseason.
Rival teams believe Butler will eventually decide to take meetings with interested suitors in July.
Jimmy Butler is starting to become a cancer on no matter what team he plays for.
He's a great player, but needs to work on his attitude and getting along with others.
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