Like the (mostly) part Chaddy ha.
He may have played 4 at the back at WBA (I honestly can't remember) but that was back in 06. 3 at the back in England certainly wasn't a popular choice then.
He has played with 3 at the back at Celtic, Boro, Coventry and now us.
Funny how you've suddenly been banging on about his preferred formation being 4-2-3-1 so much over the past few weeks. Been reading his profile on transfermarkt have you? It may say that but it certainly isn't true.
By the way read here http://www.thehardtackle.com/2011/middlesbroughs-corner-how-architect-tony-mowbray-designed-an-unbeaten-boro/ Notice his preferred formation.
But you clearly know best