Keep in mind that in the Perdoni era, freshmen weren't eligible, seasons were 10 games, and bowl stats did not count in records.
For stat purposes then, a career was 30 games. Now, 2 seasons can be 24 games--or more.
Passing related stats cannot be compared with today's game, because until the mid-80's, few teams passed very much. The tailback was more important than the QB.
Having said that, if I were picking an all-star team, I'd have 2 DEs and 2 DTs. While Gathers played some DT because of need, he was a DE. Was he better than Swilling or Coleman? I have to say no.
Then again, Coleman was an OLB.