Passive? You have been watching Andy lately?
I'm hoping Lendl has finally knocked the passivity out of him. I have this sense that Andy's a bit disdainful of guys who haven't been top, top players - remember his comments about Rusedski and Cowan? So, when journeymen players like Gilbert and Petchey tell him how he has to play, he's less likely to take heed than when he hears it from an all-time ledge.
This is a bit sad, as those journeymen players often make the best coaches - the game didn't come 100% naturally to them, so they had to use their brain and figure it out.
I think Lendl's told him to tee off on the ball and he's listening. In fact, I'm sure of it.