re: Here is every SEC schools most played opponent in football

LSU and Ole Miss--who helped form the old SWC but then didn't end up joining it--continued to play SWC teams regularly, well until the mid-1980s when the SEC mandated that a seventh conference game be played. When the SEC expanded and added an eighth conference game in the '90s, the annual Arkansas-Ole Miss was able to be absorbed into league play, but the A&M-LSU game got permanently dropped.