If he feels that Butler should sit out the superbowl, than that is what should happen.
I do know this. the Patriots would win whether Tom Brady was there or not. I don't know if the Patriots will win without Belicheck. Maybe, provided the assistants followed the current way of doing business and Tom Brady stayed on, but no guarantee.
On the other hand, in the small subject of Brady being gone, the team went 10-6 with a horrific QB many years ago and than went 3-1 last year. To me, that is a large enough sample size, that the team would be very good without Brady and if they found another good QB, maybe would not drop off much at all.