Is this when the Six-tails was sealed into Utakata? (poll 2628257)

Is this when the Six-tails was sealed into Utakata?

Yes. Kishi probably just overlooked the whole sealing at birth idea for the purpose of this arc.

I think it is, but the technique used might not require the same circumstances or factors as other sealing techniques.

No. Utakata's master was probably trying to extract his Bijuu for himself, but Utakata somehow managed to escape.

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