You can't leave out de Villiers surely. I'm of the opinion - which admittedly goes against many of the Cribbian statistical measures I tend to value at least in rating modern day long careers - that his Test career is slightly overrated, but it's mostly definitely in the top four bats of the decade along with the Big 3 (assuming that Root has fallen away too much to qualify for that metric now). I think
Jadeja is definitely underrated as a player, but to some extent that's understandable when he flat out hasn't played a lot of overseas Tests. How can you be rated as one of the best players in the decade when your own team doesn't see fit to play you a lot of the time when conditions aren't entirely conducive to your style of cricket? It also means that his statistics need to be askterix'd compared to, say, Ashwin's, who gets no such luxuries and has played a decent number of Tests in very unhelpful conditions.
Hashim Amla is getting unduly ignored in these discussions too. More runs in the decade than any but Cook, Kohli, Smith and Root. If we assume de Villiers keeps, then you wouldn't go too far wrong with a top seven of the decade of
Cook
Warner
Amla
Smith
Kohli
Williamson
de Villiers
I recognise that slotting in those two at 6 in 7 is going to look quite strange, but Amla has been the best pure #3 of the decade IMO, and this is going to happen at this level. This is a legitimately exceptional top seven here, on par with the vast majority of ATG non-Bradman top sevens.