Tuesday mail call:Andrew from Salt Lake City wants to know if I think Josh Johnson could be better backup quarterback option than Blaine Gabbert.Bill Williamson: I still think Gabbert is going to be the backup to Colin Kaepernick. He is guaranteed $2 million this season. That's a lot to eat for a backup. Yes, Gabbert looked lost in the first preseason game at Baltimore and he was not good in three seasons with Jacksonville. But unless he is totally awful in the rest of the preseason, I think we will see him on the 53-man roster.