Can't blame Newman for anything but probablay just naivty here.
The guy has had an absolute baptism of fire, hell and brimstone. As Lyon pointed out, Cousins saga, Carlton drumming, being 1-7, all the expectations, Richo future, Wallace future.. dear o dear. You take a lot more on when you captain a football club these days.
I honestly believe Newman has done the right thing here, all he has done wrong is approach the wrong person. Newman should have gone to Gary March. He should have gone to Gary March and explained "Gary, this has happened I have 12 players in my playing group that believe the playing relationship with Terry is doomed and want to start fresh immediately. It may seem as a soft way out but we don't want to waste the rest of the season."
Then it's up to the administration to do there job and look after the future of the club and then the administration could have told Newman that after Round 12 he wont be coaching.