Marks from his twitter.
https://twitter.com/MarksKevin/status/1351226768091439104

https://247sports.com/Article/Kevin-Marks-withdraws-from-transfer-portal-Buffalo-Bulls-running-back-159494517/

"One half of a dominant Bulls rushing attack last season along with Jaret Patterson, Marks initially entered the transfer portal on Jan. 11. But Marks withdrew from the portal on Monday morning, indicating he intends to return to Buffalo for his redshirt senior season. Marks had been a popular name in the transfer portal, hearing from schools such as Virginia Tech, Virginia, UCLA and North Carolina early in his transfer process. "

Had a Purdue offer
https://twitter.com/RivalsPortal/status/1349112780545290245

https://twitter.com/247SportsPortal/status/1351199527127162882

"Buffalo RB Kevin Marks has withdrawn from the portal. Marks, who ran for over 100 yards per game in 2020, had been hearing from a bunch of P-5 schools."