And what backups has The Land Tuna developed?
Teams trading Reid for his backup QBs was so commonplace that it became a joke. But if you want to talk recently, there's a guy by the name of Mahomes . . .
Cousins was a 3rd round pick and in your opinion McVay developed him. In one year.
But he can't develop Mannion. In two or more years? With only 50 passes on his resume. Cousins had a lot more work in WASH.
Cousins was a 4th round pick, but I had him rated as a 2nd round pick. I saw the goods in Cousins, even if he had his flaws. I rated Mannion as a 7th round pick/UDFA. I saw a mediocre arm, mediocre mobility, slow processing ability, an overly robotic and methodical approach, average accuracy (threw a great fade route, though), and underwhelming decision-making. He tended to play it overly safe and conservative, but when he was forced to speed up his process, he made errors.
Plus, Cousins had been working under the Shanahans too. McVay was able to finish the job and find a system that worked for Cousins. Simply put, Mannion doesn't have the goods. Cousins did.
Yet he can magically develop the #3 overall pick in the first round into a solid backup after that player has been a turnover machine and crappy QB . After 5 seasons of average to crap play he can be transformed.
Nothing magical. He's not going to fix Bortles. What he can do is help Bortles improve to some extent and put him in a scheme/offense that will highlight his strengths. He's not going to turn Bortles into Brady, but he can do enough to make Bortles look good that Bortles might be able to rebuild his value.