I had considered Geno Smith but he really wasn't all that good in Seattle other than the '22 season. He is currently sitting 22nd in QBR with 14 TDs and 12 picks.
Gannon in Minnesota didn't impress. He started 12, 11, and 12 games in 3 consecutive seasons so it looks to me that he was given a fair chance to seize the starting job but he kept gettiing benched for sucking. I remember his cup of coffee with the Redskins, he was just another body in the long list of QBs here. Then he goes to the Raiders and is MVP of the league, still one of the most surprising things I have ever seen in football.