I can't see any of those guys as an upgrade on Mayfield...assuming Baker's shoulder is healthy and he can return to his 2020 form. Ryan is old, obscenely expensive, a statue, and is declining; Jimmy G has serious limitations, gets hurt a lot and is prone to the same turnover issues Baker has; Winston chucked 30+ interceptions a couple of seasons ago, so if turnovers are a concern, that's a non-starter; Mariota is a total roll of the dice, but might be the best fit of the four of them.
Cleveland has been the worst franchise in the NFL, if not all of sports, for 23 years. The other 3 might not be in the best shape right now, but they've all had multiple runs of success during that same period. It's probably easier to trust them to get right. I'm from NE Ohio, love the area, but if I'm an NFL player with other options, the Clowns are at the bottom of the list of teams I would want to play for. Could be a weather thing, too...