here is sasuke blown apart by version 1 lariat:
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here is kisame getting blown apart by version 2 lariat:
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sasuke and kisame (who had samehada as a shield) whos bodies are more durable than itachi's got blown to pieces by lariat. if itachi gets hit he would die.
also dont forget that if killer bee hits itachi with his head, itachi's head would roll.
you're using the databooks which made countless mistakes measuring the character's strength. sasuke clearly deserves to have at least 4 or even 4.5.