Are you saying they asked coaches of other teams? lol, you're reaching big time with that one. However unlikely that approach may be, let's go ahead and assume that's what Breer did, just for the sake of argument. How else would coaches of other teams know that he's a pain in the ass unless they were hearing it from seattle coaches? Maybe there's a conspiracy among coaches of other teams to trash Bennett as much as they can? lol, c'mon now.
People parrot all kinds of nonsense about teams from outside. See: Philadelphia Eagles, history
Bennett is respected as a player, and if the coaching staff is okay letting grownups be grownups, then he's going to be A-OK. If the coaching staff has to make all the players be automatons, then he might be a problem.
I'm just going off what an outsider sees of this year's Eagles, but they seem to shade to the side of letting adults be adults.