This is JG's 7th season as the HC and 10th season as coach for the Boys. He should know that this could be called. It's his job to know and not chance it.
God, I hate blanket statements like this because they are so subjective.
1) As another poster put it how can you anticipate something that NEVER happens, or at least is never called? As someone with management experience I can attest to the fact you can tie yourself up in knots trying to design a strategy for every concieveable possibility. Its also unworkable because there are only so many hours that players and coaches can use in a week.
2) A sideline in a football game is organizational chaos. There are so many moving parts, from players to coaches to calls to getting the right players & packages on the field. BB got confused and thought he was apart of the package so he ran out there. If he hadn't and JG had to burn a TO we would have been killing him and Garrett the other way.
3) Everyone lauds Mike McCarthy for how well prepared his teams are. Yet his team did the exact same thing. The difference was they didn't get called for it and Dallas did.
IMO, it was a bull^&%p call. Fundamentally I just don't like when refs interject themselves into playoff games on ticky-tac infractions. Refs need to exercise discretion in playoff games and let the players on the field decide the outcome.
At worst there should have been a warning issued to Garrett & staff over that as the letter of the rule wasn't violated.