If you had asked the Manchester United supporters a couple of years back which of their former coaches would end up in the Premier League first, you’d have forgiven the majority if they opted for Michael Carrick. The Champions League-winning midfielder had already had a brief if promising spell in charge of the first-team, after all, stepping into the breach and claiming impressive results against Chelsea, Villarreal and Arsenal following the tear-jerking departure of Ole Gunnar Solskjaer. What’s more, while Middlesbrough may have been struggling at the wrong end of the Championship when Carri…