As I have previously argued: Ninja's are all about deception, therefore no Ninja would admit to being a Ninja. Anyone who therefore claims to be a Ninja is, by default, not a Ninja. 'Team Ninja', by definition, has no Ninja's. Therefore it sucks. Sucks like a crack whore on a ten dollar promise.

Also by default the only team from 'Team Pirate' and 'Team ninja' that can logically contain Ninja's, as shown in the paragraph above, is 'Team Pirate', giving it the double whammy.