We don't know anything about the backups yet.
1st game last year against the Bears does not define Kizer. The offensive line stunk. The play calls stunk. Mid first half he was thrust into the offense which relied on Rodgers skill and experience to make changes at the line.
This new offense is supposed to be just do this; if it doesn't work, we'll try a different play. Much less responsibility. Should be a lot easier for less qualified quarterbacks.
Let's wait and see. I know it sucks, but whi are you going to bring in? If it's not done now, it shouldn't be done.
Lastly, if he doesn't believe he can do the job, I don't want him there. We may not think he can do it, but he must think he can do it.