I don't think trying to get Perese to replicate Kerevi's crash ball at 12 is the answer. We probably need to adjust the game-plan away from a crash baller focus, anyway. Maybe re-focus on kicking more effectively.
I noticed on the weekend that there was a lot of sterile possession in between the 22s with fuck all rugby going on. This seemed in part because our ruck security was ponderous (and the Japanese were playing sillybuggers a fair bit, as pointed out in that article). But we also didn't seem to get over the gainline, in tight or out wide (again, Japan seemed offside at every ruck - but play what's infront).
We need a better idea of what to do with the ball in these situations. We cant rely on 100m of Kerevi breaks every match (because its pretty clear he wont be there if it doesn't suit his paymasters). And when we arent carrying very effectively and carrying in non-threatening areas its an easy excuse for the defending team to attack the ball at the breakdown.