In my book he lost 115:113 against Huck under Tszyu which should've happened under no circumstances. The fight should've not been remotely close given that Huck epitomizes the brainless cavemen style whereas Povetkin is a gold medalist. That said, I wouldn't necessarily say he was better under Atlas. I liked Povetkin best when he beat Byrd and Chambers with that Russian dude in his corner. The same trainer who also trained or trains Lebedev if my memory serves me right.
All 4 of these guys are overweight. Povetkin and Pulev about 10 lbs, Rahman and Ustinov about 15 lbs. Povetkin/Rahman is a joke fight...Pulev/Ustinov is the real event.
Ustinov should lose way more than 15 lbs, but anyway I'd say his footspeed is less of a problem than his handspeed.
Rahman should lose 20 lbs, Povetkin 10 lbs, Ustinov 30-40 lbs. Pulev is kind of heavy probably becuase he has thick legs. He is not flabby or something.