Supposedly transferring due to personal issues (family?) By all accounts, LSU planned on him being a full time starter in 2020, so they didn't run him off. They actually convinced him to withdraw from the portal once before (he went into the portal early Feb, withdrew name, then went back in) . They wanted him on the team. He's a pass rush DT (14 sacks as a HS junior), which is perfect for Manny's aggressive 4-3.
https://digbr.com/future-tiger-spotlight-davin-cotton/
FIFY - here is the article that is referenced
LSU defensive tackle Davin Cotton re-enters the NCAA transfer portal
LSU defensive tackle Davin Cotton is back in the NCAA transfer portal, a source told The Advocate.
Go Canes