The Barton business is causing me to have doubts. Not the indefinite suspension- I suspect Barton is an indefinite offender - but the signing. If Warburton wanted him I reckon that shows poor judgement of the player and the man. If somebody else wanted him, why did MW agree?
There is history of good man managers coping with problem children. Walter with Gazzza, Stein with Willie Hamilton. I don't know if MW is good at man management but Barton is a problem adult, not a problem child and I suspect is beyond management.