Having Hiramekarei is a significant advantage though, it's reach and speed are incredibly dangerous.
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Zabuza can't afford to be hit by high level Katon or Raiton either.
From what we've seen, weaknesses must be taken advantage of to defeat Mangetsu.
No one has to focus on any specific weakness that Zabuza possesses.
Having to rely on the Hidden Mist Technique
does make Zabuza one-dimensional.
Mangetsu may be unable to avoid Genjtsu.
He can certainly endure things that Zabuza can't.