[quote=DaDrummer676]
Matsuo's Kekkei Genkai would go against his Kaimon. Seeing as it completely destroys the user's body.
[/quote]

The point of the KG is to help the Bushou clan recover from injuries quickly. They are incredibly valuable as warriors due to the rate at which they recover from wounds that would incapacitate or even permanently cripple other ninja. It doesn't go against Gates, it actually pairs with them fantastically.