What he said should not surprise anyone. Jerry Jones' mentality has self-supported keeping himself the general manager for over 29 years. That is not stubbornness. That is not a side-effect of alcoholism. That is not a product of dementia. It is mental though in my opinion.
I think he's reached the point where the louder the criticisms get, the more steadfast and stubborn he gets because he is desperate to be able to tell people how smart and forward thinking he was in the face of criticism.
It's going to cost this franchise for years to come as long as he's the main voice in the franchise (it already has cost the franchise).
I say this dead seriously............. I would not be surprised that if this team went 3-13 or 4-12, Jerry still brought Garrett back. It would seem painfully obvious that a disaster season like that would, for any sane fan, owner, GM, whatever - result in the removal of a head coach with the resume Garrett has. It's perfectly logical.
But for Jerry it's almost like a season like that is just another opportunity to tell all of us how dumb we are and how smart he is.