Mozgov is certainly more imposing than Z. Z was a very highly skilled big man and I love the guy but Moz just eats up so much space and then makes it even more disruptive with his quickness. He can change direction very quickly, has the athleticism to make up a lot of ground in a short period of time and keeps his hands up which basically creates a wall. His ability to disrupt the opposing teams offense far exceeds that of Big Z. He's an impressive athlete for his size and he has completely transformed the opposing teams offensive game plan. Tremendous work by Griffin to turn this thing around.