Which QB is more vital to his team's success?
Tommy Armstrong
Taysom Hill
Taysom Hill. He is the lynch pin holding that team together. Look at the skid they went on last year when he went down.
You're correct. When healthy, Taysom is one of the best QB's in the country, which we saw last year with him starting to appear in the national Heisman discussions after game 4. He would be a huge loss to any team, not just BYU.
However, there were a bunch of other injuries last year that exacerbated his loss. Also, last year's backup QB had actually moved on and intended to leave football. The coaches actually had to convince him to return for 2014, as QB depth was poor.
This year, though the backups are freshmen, one was a blue chip recruit, and the next two are sons of former NFL players (Merrill Hoge and Koy Detmer). Still a better situation than a guy who had to be begged to not quit football.