I think there definitely is more to this, probably even more than just the fight he had with the unofficial OC Bill O'Brien Monday.
As big of a Pats homer as I can be, I don't think they were getting close to the SB this year. I think BB didn't want to have a toxic personality somewhat like what Adalius Thomas was last year to negatively influence the young guys on the team.
This team needs guys like Mayo to step up and be leaders like Bruschi, Vrabel, and Rodney were.
I think it would have payed dividends to that D to try and keep Vrabel there, especially with Bruschi and Harrison retiring.