I really don't think Scott will be a contender, he hasn't shown anything in attack and therefore Barritt is ahead of him because Barritt is a better defender. Neither player is much of an attacking threat, but Barritt has the edge. Same with Roberts - better defence than Scott so is higher in the pecking order. There are no stand-out inside centres obviously, so potentially putting O'Driscoll at 12 could work. He has great distribution, spots gaps easily, and offloads and has a great passing game. O'Driscoll with Tuilagi outside him could work well, I just wouldn't have Tuilagi at 12 and O'Driscoll at 13. The ball would rarely get to O'Driscoll because Tuilagi, in the second receiver channel, would take it into contact too often without getting it out O'Driscoll.