I wonder if the Exeter game plan has taken a bit of a knock by the new ruck interpretations / enforcement. They have always favoured d(r)iving over rucks to either win the ball or a penalty and seem to condition players to do that. A while ago Rob said something to the effect of the balance of winning the ball in a jackle was outweighed by the risk of penalties. I wonder if they now need to increase their jackle ability.
The risk of the jackle seemed to be reinforced by the ruck enforcement changes a few years ago after the Italy uncontested game. Wasps seemed to suffer then. This time the changes seem to swing the balance back towards the jackle.
(Sorry couldn't resist the dive reference, certainly my perception was they were often off feet as a shoulder landed on one of our players. At least that now gets pinged occasionally.)