no idea, but i can guess. he focuses on clean & jerk, rather than snatch ( i think ) and on CJ people don't seem to go as deep with their ass, nor for as long a time - they seem to try to bounce right back as quickly as possible ... maybe to save the energy for the Jerk part ?
klokov seems to squat very deep, but klokov seems to be more of a snatch guy, and ilya more of a CJ guy. maybe i'm wrong.