Philadelphia 76ers All-Star Jimmy Butler has aggressively challenged coach Brett Brown on his role in the offense, complicating an already tenuous chemistry among the team's Big 3 hierarchy, league sources told ESPN.
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 told people within the organization that he had no issues with that exchange and considered it within the confines of the relationship that he's developed with Butler, sources said.
While a source close to Butler contends that his intense, direct style can come off as combative as he's trying to make clear his viewpoints, Butler's sluggish assimilation into the Sixers environment is causing some concern about his long-term viability and fit with the organization, league sources said.