They were 4 lbs apart at weigh in. Kimbo at 212, Houston at 208. It was a 215 catchweight fight. Houston normally fights at LHW (205). Kimbo's normally a 230 lb HW. Houston's last fight was at heavyweight in a different organization (he weighed in under 215 for that fight iirc). Kimbo had to cut and was 212 at weigh ins so he rehydrated to being probably 220+. He was still leaner than he's been in all of his previous fights. Houston didn't have to cut much at all. The 10+ lb difference come fight time can show drastically especially when Kimbo's physique is more top heavy and Houston does have more size on his legs. Add in Kimbo's 2 inch height advantage and you see one guy looking "bigger" than the other.