Baylor Romney is good and solid, but the typical good backup. He's not going to hurt you, but he's not going to take you to another level.
Sol-Jay isn't really in the conversation yet and might never be.
So it comes down to Hall vs Conover. And seniority/experience gives the edge to Hall. Plus, if Hall loses to Conover, you have to worry about an exodus from the QB room (maybe to another school, maybe just to focus on baseball).