Crennel said he won't necessarily tailor the game plan for Quinn, partly because he believes that the former Notre Dame quarterback does a lot of the same things Cassel can do.
"They have a similar skill set. They both can throw the ball, they're both experienced," he said. "Matt has more game time, and that's the biggest difference. Actual time in the game."
There's an even more precipitous drop-off in experience if Stanzi is forced to play.
The Chiefs' fifth-round draft pick last season spent the majority of the year on the practice squad, and never appeared to be a viable option when Cassel missed the end of the season with an injury to his throwing hand. Tyler Palko and, later on, Kyle Orton took those snaps.
Stanzi was just 9 of 18 for 91 yards with an interception during the preseason.
"I'm confident he knows the system. He's been with us," Crennel said. "He's as ready as he's going to be, and that's not going to change in a few days."