hes not got the natural lean look of haye, dirrell or ssm.
however he could get down to 130, imo that should be his main focus now, on getting himself in proper fighting condition and getting down to 130.
135 is perfect for him, some people just aren't ripped when they get in the ring and Diaz does just fine at that weight. He may look flabby but he doesn't have stamina problems at 135 at all.
I think he can but maybe he just looks like that naturally, He has an exciting style that i like and if it doesnt work out for him he can alway look back and say he held the 3 different titles in the lightweight division.