if a QB goes down, someone behind him will step in and do well. This was the first season in a very long time where BYU had some decent depth at QB.
Not to mention that if Tanner goes on a mission and Dink were to come here as well, Dink could come in and then start as a sophomore and play two or three years and then in comes Tanner. That is if either of them pans out as a college level QB.