My theory is that Kerrison was too radical in the training regime this year. I suspect he made lots of changes, and that has had the effect we have seen signs of for team sky pretty much since since Dauphine. Most seem more tired, while a few have shined from time to time. I suspect this is due to the individual adaptations in their training.
But this is complex, since they probably have different programs individually adapted, but with one common theme.
We will probably see improvements next year, since they will have learned from their mistakes.
Anyway all that extra training this year might just pay off next year. Who knows.