True although we don't know if Tobirama can create that much water to flood the battlefield. Going off of manga feats he can't.
Furthermore If Tobirama was to use so much Suiton against Sasuke it would be his downfall considering Sasuke could use Chidori to turn the Water against Tobirama. It is already been shown that Sasuke can Tank water and Chidori so it is safe to say this would more than likely be Tobirama down fall.
Also people forget Sasuke has enton orb in ribcage susanoo meaning he can defend AND jump around with rib cage susanoo
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