Mozgov is slowing down. All that size and weight. Physically, it looked like he took a big step back last season. I don't think he will age well. He will struggle too much with the pace and mobility required of a center nowadays.
I think they have just swapped out Hibbert for Mozgov. Two similar players. Excellent size. Slow footed. Similar defensive strengths and weaknesses. Hibbert a better passer. Mozgov a better rebounder. Mozgov a bit more efficient scoring wise but fairly similar skill-set. I don't think the Lakers have improved at all by swapping Hibbert for Mozgov and they have screwed themselves with this terrible contract.