I can see how there'd be beef between Butler and the rest of the Bulls. It's become apparent that Butler didn't want to just be a part of a winning team, he wanted to be the man leading that team. Thing was he probably was always like this but just didn't have the clout early on as the guy at the end of the bench.
Noah and the others liked him as he was seemingly a quiet unnassuming guy that transformed into a scrappy role player around 2013-14. That's what they thought his ceiling was... problem was Butler's growth didn't stop there. He kept getting better to the point that it was debatable whether it was him or Rose's team and that's when things really started to unravel.
Noah has always been in Rose's corner but I could see Butler looking at Rose missing all that time and thinking "why shouldn't I be the man?" which would cause dissension within the Bulls heirarchy. What made Rose so good as the leader of those Bulls squads was that he never sought it out; it just came naturally since he was their best player. With Butler however it always felt forced.
The whole saga seems kinda Kobe-esque to me really. Like how when Kobe was young no one really knew his real personality, then as he started getting better it started to show. As Kobe got better his relationship with the established guy (Shaq) deteriorated as he pushed to be the man himself, thinking himself a better candidate as a guy that works hard over Shaq, who he saw as lazy and didn't take the game as seriously as he did