Not if the Instant answer is sufficient.

That's assuming that the instant answer is even directionally correct. A misleading instant answer could pollute the context and lead the thinking model astray.

Can the context of the pre-revision, Instant response be simply be discarded -- or forked or branched or [insert appropriate nomenclature here] -- instead of being included as potential poison?

(It seems absurd that to consider that there may be no undo button that the machine can push.)