No, I would say that maybe their talent allowed any issues to be ignored, and their arrogance maybe wasnt as strong last year as they werent reigning premiers.
as is often said it is very hard to win one premiership, let alone multiple, and a lot needs to go right. i cannot see how off field culture cannot be a factor in training efforts and in injury and rehab management. i also cannot see how a closeness of a group can be ignored contributing to whether those players do everything they can to make their teammates succeed.