Not trying to fill the role of AKC but...
I know the Bills could always shore up the position between now and September,but they are one serious injury away to Stroud(who is on the wrong side of 30) to being in really bad shape at the position. That would leave them with...
1.)Williams(overacheiving high motor guy)
2.)McCargo(so bad they tried to trade him and hoped Indy wouldn't flunk him at time of physical)
3.)Johnson(signed last year as a FA, but has yet to be seen).
I think that only at the QB position would an injury be more disastrous.