Renck: Broncos’ grade at QB since Peyton Manning is a D or F. Is the answer J.J. McCarthy?

This is Sean Payton’s biggest decision. Will he make it this spring or wait until next year’s draft when Shedeur Sanders, Quinn Ewers and Carson Beck will be in the mix? Since Manning retired, the Broncos’ quarterback grade is a D or F. Is the answer J.J. (McCarthy)? I asked Mighigan man Jake Butt.