Not directly related to the transfer portal, but another example of the trainwreck that is NCAA sports. Baylor basketball just signed a guy who played pro basketball for 5 years and was a former NBA draft pick.
This is far from the first, if you're talking about ~quasi-pros still having college eligibility: https://www.espn.com/mens-college-b...ew-defends-james-nnaji-signing-amid-criticism https://www.espn.com/mens-college-b...rlie-baker-players-nba-contracts-not-eligible