It's impossible to judge the severity of Zac Lee's injury from a computer chair. His injury required surgery post-season, and he had to sit out spring ball. If anything he deserves credit for playing hurt last season, in which he made several key plays that contribuited to wins. He didn't whine once or hang is arm to the side when things weren't going well for the offense, he stuck in there and played through it.
That earns respect from your teammates. That's leadership.
Furthermore, T Mart has a lot to learn on the field. Bo's going for a national championship and having a returning starter QB is crucial.
GBR