I couldn't find anything that specifically said he played guard, but I did find this, which surprised me: "Although used primarily as a backup and special teams player during his first three seasons, Slater became the starting right tackle in 1979." [
en.wikipedia.org]
Apparently some OL took time to develop, even back in the day.
There was this blurb about him playing guard in college: "He was a tackle his sophomore year and again as a junior - with the exception of one game - and was switched to guard his senior season. The one game exception in his junior year was in a game against Grambling when he was moved to the guard position to block the highly touted Gary "Big Hands" Johnson. Although Johnson went on to a successful career with the San Diego Chargers, on that day, Slater was the more dominant player." [
www.profootballhof.com]
AlbaNY_Ram
