Dont worry, he's still only rocking two, Leaf and Cloud. Try not to be confused about it, Katsuo is essentially the peace keeper. He wants tranquility between the five great nations now, he intends to visit each region of the land and research it thoroughly, making each place a little 'home' for himself if need be.
Here's the thing, he wont be adhering to any form class/clan/nation restrictions. He's basically the most open-minded ninja in the world. So, he technically has no loyalties other than protect and bring peace to anyone and everyone he can. Inadvertently, he has to crack a few skulls to get the peaceful point across.