Any player who is in a supplemental draft is there for a reason — and in most cases the reasons aren’t good. In recent years, the NFL has made it difficult for a player simply to apply for the supplemental draft. In most cases, for a player to be eligible to be in a supplemental draft, there is basically no way he can play college football in the coming season, even if he transfers down.
In the case of Western Michigan’s Sam Beal (read Gabriel's scouting report of Beal), he was declared academically ineligible at Western and would not be allowed to play in the 2018 college football season.