Cam's been on record multiple times publically showing displeasure with many of the moves and decision made in the Tepper era starting with Matt Rhule.
We all knew Cam's second stint was a PR stunt during a lost season to help drive some fan excitement. But Cam has stated that he was set up for failure by Tepper/Rhule when he was starting just a week after resigning w/o knowing any of the playbook. Then Joe Brady was fired midseason just as they were game planning over the bye week. Plus Sam Darnold's beef/jealousy when Cam was resigned. Cam has also stated how Tepper/front office/and coaching staff has failed regarding the development of Bryce Young.
Cam has also directly said he wanted to be Panther's president in order to help with marketing and driving fan's interest which Tepper has likely ignored.
We all know that Tepper is the petty type specifically buying his former boss's house and demolishing it afterwards, having beef with reporters, throwing drinks at fans, etc.