Shouldn't that go both ways? They still have to be able to generate traction and force to push him. Is he not able to do the same thing?
Should he not (a) be moving his feet more (b) have better cleats
It does go both ways to an extent, but to me you need better footing when you're the one that has to react. The defender knows where he is going on the pass rush so he can be a bit more secure in his footing. Basically the opposite of the CB/WR interaction.