On Shemar Stewart topic, Mike Florio (ProFootballTalk/NBC) did a write up on his options based on current rules/laws. From the college side, NCAA could rule him ineligible, but we are in the NIL era where "signing with an agent" happens in high school so Stewart didn't really do anything during the draft process that pulled in benefits he couldn't have got from aggy or another program. NCAA may not fight this and show how toothless they are, plus it could a new wave of college players trying to pull shit without consequence before a de-pantsed NCAA. Florio went on to say he thinks the Transfer Portal rules wouldn't hold up if challenged in court and players could/should be able to "work" as independent employees and contractors and could transfer any time, any where they want (they'd just have to be enrolled before the season to be eligible). So in theory, Stewart could also go to any college he wanted next year if someone bid more than aggy.
From the NFL side, previously if a drafted player held out, they'd become a free agent after one year (the next draft). But the rule is written that it's one year/draft after they are ineligible for college football. Up until now, it was assumed any drafted player is ineligible to play college again so their rights are owned by the drafting team for one year. In the Stewart scenario if he went back to college, the Bengals would continue to own his draft rights until one year after his college eligibility expires. If he plays for aggy in 2025, he would not be draft eligible in April 2026 because the Bengals own his rights. He'd have to actually not play college football for a year to become a free agent. Or more realistically, they come to a contract agreement or the Bengals trade his rights to a team that will.