From the episode

going from Caleb Williams to, if he doesn't play this week, to potentially Case Keenum, that's a different playbook.

STACKED’s take

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Caleb to Keenum requires playbook shrink; different offensive identity.

Going from Caleb Williams to backup Case Keenum would require a different playbook; the source contrasts this with the Darnold-to-Locke transition, noting that Keenum's skill set would necessitate offensive adjustments, whereas Locke can preserve the Bears' offensive identity.

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