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

Elvis said

Not really. Stylistically Haener makes a better gameday backup for Carr than Rattler. That doesn't mean he's next up to start.

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I agree. Didn’t we have Winston as backup all year and he finished the game where drew was injured but then Hill got the starts moving forward until Drew returned. Then once Drew was starting again, Winston was back-up again. I can see a similar situation here. It’s not unheard of.