I dont think thats it at all. I genuinely think Cal McNair is a moron. He was always tugging at his daddies pant leg, and was never forced to become his own man. He's a beta pretending to be an alpha. He allowed OBrien to steal his daddies team right from under him all in the name of CREAM.
I think OBrien cornered Cal and bullied him into giving him complete control and Cal was too big of a

to fight back.
Systemic deficiencies are impossible for players to overcome. Hopefully OBrien just wants to play GM and give up the HC role, but Im not holding my breath.
Want a fun exercise? Think of all the football men in NFL history who have been given complete personnel control .. short list. Then ask yourself what the hell OBrien is doing being mentioned with those great men? LOL.