If professional wrestling is like BJJ/Submission Grappling's learning disabled younger brother, then collegiate wrestling is it's overachieving older brother who also enjoys inflicting nuggies and an occasional atomic situp prank.
Grapplers, I don't pretend to know everything about wrestling. but, I do now that their programs are intense, disciplined and systematic. These three concepts, although present in BJJ, are often not its primary focus. We can learn a lot from our older brother.
Watch this clip [courtesy of flowrestling] featuring one of college wrestling's best and most successful coaches in recent years, Mark Cody (now head coach at Oklahoma University, and formerly at American University). No doubt, this man knows of what he teaches. In this case, he's instructing on breaking down an opponent in the defensive starting position. No, it's not applicable to the the BJJ/sub grappling game per se, but the concept of constant pressure and not relaxing into a weak or passive position is. Check it ... and stay out of the chicken zone.