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

Elvis said
I think it was Mike Triplett that pointed out that while Haener has been game day backup because he is a better fit behind Carr, they are technically co-second team QBs. Either of them could start and it wouldn't require changing the depth chart or demoting anyone.
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IMO, there is no such thing as co-QB anything, thats never worked. You start the QB who gives you the best chance to win, to me it’s obviously Rattler, we will see what happens….