Andy Reid and Bienemy comes to mind. You can tell a lot about how a guy is viewed from looking at the relationship from the outside in. Eagles poached Moore from a division rival and Sirianni immediately gave him his play calling duties.
Reid took playcalling duties routinely from Bienemy and chose to let him walk for a parallel move and had no plans on bringing him back, even hiring Matt Nagy when he was available.
Sure coaches will never say anything negative to the press, it's the lack of what they do say that speaks volumes.