QB Controversy Coming in Nashville

Why did the FO desinate MM as the starter and Mett as the backup without stepping onto the field and competeing for the starter role? How is this going to make Mett feel if he is better at camp and after the lies told to him after last season? How is the lockerroom/vets feel if Mett is better in practice and MM struggles in camp,preseason, and begginning of the season? The other players know who can throw the nfl passess better. Keep Mett on the bench and continue losing for the whole season? Ta