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 get it, im just saying the whole co #2 idea is just silly if one is running scout team and the other is prepping for games. It's coach speak for ego protection.