perfect for 2 reasons.
1. As you said he can be the backup and not have to perform right away.
2. Palmer is bound to get hurt and miss at least 1 or 2 games which should get him some playing time his rookie year. I guess you could look at that like it is opposite of the first but some playing time is better than having to be the man for an entire season on a crappy team.
I really want Kizer to succeed.
And I don't think #2 is the opposite of #1 because of expectations. If Kizer is drafted by Cleveland, he has to be the savior in year one and if he completes 57% of his passes and has a 1:1 TD to interception ratio, he's the next bum in a long line. But if Palmer gets hurt and Kizer comes in for a couple games and completes 58% of his passes including 3 TDs and 3 INTs, he has done a great job filling in unexpectedly.