Why don't more fighters come into the ring drenching in sweat for the first round? They are coming from the locker room and could get a pretty good work out before the fight. In boxing some fighters use to spar a whole round before there fight. I do know the judge towels them off, but if they were hot the sweat will come back pretty fast.
Is there anything you can take to help you sweat? The reason to be more slippery to prevent locks.
Also, don't take a shower and eat something that makes you smell like crap. I remember I fought in a tournament this guy I was grappling with smelled so bad I came very close to throwing up. At the end of the fight I was so gassed when I would take deep breaths it literally would make me sick. I took days to get that odor out of my mind.