I'll say Rodney Bellinger.
It has to be somebody from 1983 because there's no guarantee anything else follows minus that season. Then I had to isolate the secondary, which was so spectacular. I attended every home game. That team not only led the nation in yards allowed per pass attempt -- my favorite stat -- but a little known fact is the defense didn't allow a single play beyond 28 yards the entire season, until that bowl game against Nebraska. Ten consecutive foes were held to 17 points or fewer after the opening debacle at Gainesville.
I could have chosen others from the secondary. Calhoun is the obvious pick from the bowl game, given how it ended. But Bellinger was often the defensive star of that game and that season, with so many clutch tackles versus the run and pass.
In desperate situations
#4 would flash and make a critical tackle, seemingly out of nowhere and often by ankles and inches.
***
Somebody nominated Ottis Anderson earlier in this thread. He was obviously high profile including Super Bowl MVP. However, it's true that he is desperately underappreciated these days, by younger Canes fans and even ones who grew up with those '80s teams as first memory. Anderson was an absolute freak, and superior in college to any Miami running back who followed. Amazing feet. The first defender had no chance. Unfortunately not many clips are available.
Anderson got heavy after his first few years in the NFL. Too many fans envision him as a plowhorse type in his Giants years. The reality of his younger years could not be further removed from that. Prior to our glory years, Ted Hendricks and O.J. Anderson were the two dominant athletes who stood out after I started following the Canes as a young kid in the late '60s.