What did Slater say? He said of course he would say NO if he was asked would it help the team for Butler to sit. But you could say that about ANY player on the team.
A more interesting question would be, to Slater, should Belichick drop his disciplinary standards prior to Super Bowls because they are so important? That would have been a discussion.
Browner, blah, blah. Butler was not better than Gilmore, McCourty, Hightower, Chung or Elandon Roberts for that matter. Butler, in fact, was a Belichick creation, the same way so many of our DB UDFAs are, they do well in the Patriots system and then go on to sign big contracts elsewhere, where they get burned constantly and do nothing. We've seen it over and over again.
Heck, the play Butler is most famous for is a play he blew in practice and which he was taught to look for and taught about the ways to counter it. Credit Butler for taking to good coaching, but once he was on his own he failed miserably.