Those four were absolutely amazing over multiple years.
I would have put Michael Stonebreaker in that list, but he wasn't physically the same player he was in 1988, after he shredded his knee (causing him to miss the 1989 season) in that drunken car accident. He ended up with blurred and / or double vision, significantly slower speed, and lost a bit on his reaction time.
Nevertheless, he was still an incredible player for us in 1990, demonstrating the epitome of football smarts, regularly putting himself in the right place at the right time, even with all of the physical limitations.
I still think about how 1989 would have turned out, had Stonebreaker and George "Boo" Williams been able to play for that squad. That would easily have been one the most powerful front seven units in all of college football of all time. I pretty sure, that Craig Erickson wouldn't have had all of that time to heave that completed long bomb to Randall Hill on 3rd and 44 that broke our backs that year.