Is Root a proven three though? Haven't most of his runs come at four or five?
Can see Denly lasting one test in the Ashes and then Sibley coming in.
They have. I suppose I meant he has a proven temperament/skillset to come in there given he's done so in ODIs and his average is still 40+ at 3 in tests. There is an argument for moving Root as your best batsman to 3 in lieu of any proper 3s, but the counter as you say is that he's played better lower down and wants to play lower down himself.
To be honest my worry is that wherever Root plays he'll find himself coming in with no runs on board having to repair our innings.