Of course Avant's comments contributed to his release. And of course the staff is not going to admit it.
You don't let the inmates run the asylum. Ever. End of story. Interesting that the rest of the NFL isn't clamoring to sign Avant and that he has apparently decided to clam-up on the criticism of his former coaches. Shutting his mouth and performing is the only way he has a chance at staying in the league.
The real story in the Avant release is what it says about the front office.
Cutting Avant puts some superficial egg on Gettleman's face...but Gettleman did it, in order to support Rivera and Rivera's staff.
Not much information leaks out of the GM's office, but Gettleman signed off on Rivera's extension. He warned everyone there was probably going to be a step back this season. Gettleman has been around the league long enough not to make decisions as if he were a pouting 12 year old girl who just lost her Justin Beiber tickets.