I used to think he was a good coach but in the last year hes proven himself to be a raging jerk.
I assume that you are referring to Arians. Being a good coach doesn’t translate into being outstanding at all other things—I think that in Saban’s case it likely inhibits his judgment in a manner that seems calculated to enhance himself as an effective coach if being effective involves winning rather than shaping the whole character.
I’ve largely ceased to care about most people involved with the NFL (or sports in general), but have some vestigial interest in Brady, and more in Saban and Alabama. Generally those at the highest level of most things are very good at what they do and at best mediocre, and usually worse, at everything else.