They did it every game. Edwards, Fitz Brohm then Fitz Brohm Brown. Every single game. The only reason Brown didn't make the team out of camp was because Trent was a good practice player. The new coaches needed to see Trent in more live action. Brown was told that he'd be back if anything went wrong.
Regardless of his job on game day, the last thing you want to happen, like it did to the Bills two seasons ago, is have your top two QBs go down in the same game. Remember when Fitz started, sprained an ankle, Edwards came in an Sprained an Ankle and then Fitz went back in? Brohm started the next week in ATL. Chan move his QBs around. Brad Smith was NOT brought in to be the 3rd QB. No way. He was brought in to be a play maker. He'll be a play maker. He will never be listed as the team's 3rd QB.