Jozu was the Third Division Commander of the Whitebeard Pirates. He joined the crew while he was still very young. Over time, he became someone that Whitebeard could rely on in times of peril.
Ace himself built up a crew, known as the Spade Pirates, but they proved to be no match for the Whitebeard Pirates. Ace was opposed to the idea of being a subordinate for some time but eventually ...
This theory is supported by the encounter between Shanks and Whitebeard in chapter 434. The captain of the Red-Headed Pirates warns Whitebeard about Blackbeard. In this conversation, Whitebeard ...