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

RJS said
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.
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That and IMHO until you find a definite answer you should draft a QB every year.