QB Spencer Rattler is a strong candidate to start in Derek Carr’s absence, sources tell Garafolo and Rapoport

limeyjohn said

My question is that if they had a lot of faith in Jake before the season started then why even draft Ratter?

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Not every player is drafted with the expectation to be a starter. A cost controlled backup QB That you can have for multiple years is a pretty valuable commodity. If he happens to be more than that, you've hit the lottery.