Cam didn’t step up in big games. Outside of the 2015 NFC Championship, he was mediocre as fuck against playoff teams.
He beat you by being big, fast, and athletic, but if a D had Carolina out schemed, he didn’t have the mechanics to beat you with actual quarterbacking.
When that shoulder issue took hold, it was over for him. The rocket arm was compromised and he had nothing to fall back on. He’s one of the best examples of how elite athleticism will not sustain you at that level.
And yeah, being an asshole never helped his case.