Sneakylong I’m aware of the win differential, but Jimmy G. didn’t start his career at a team that won only 38 games in the prior decade.
Having said that, I have no idea if Baker is any good or not. My sense is based upon my perception of him coming out of college and I haven’t watched him in the pros. His interceptions are off the chart bad, so maybe not. Garoppolo’s interception to TD ratio is pretty sucky too, but not as bad as Mayfield’s.