Van and Traps are both right. It's a rebound, and his body is still holding low BF. Real important to taper alot of contest tools even after the contest. The rebound is the 2nd most dangerous part of bodybuilding, after diuretics. I know 2 guys that have rebounded by 40lbs in as little as 20hrs, one was sent to the hospital, and put back on lasix, the other just waddled to our amusement for a few days.