I would start my theory with a well-observed reality that Oda is a master of foreshadowing. This theory has three parts, the first two parts are the ones I came up with in OJ and the last part is the one first mentioned by
@Sadistic Senpai.
first part:
When Kinemon came up with costumes for Luffy, Zoro and himself, he made Luffy into a Fish, Zoro to a Cat and Himself into a Frog. I think this is created in such a way to hint at the characteristics of future Straw Hats with fish being Jinbe and cat being Pedro. When I propose this as a part of my theory in OJ after the presumed death of Pedro, a certain section of the community did their best to jeer at me.
second part:
Luffy asked a centaur to join his crew and the centaur had Jaguar pattern in his animal half of the body. Apart from that Oda created many cover pages with Straw hats wearing Jaguar pattern dresses.
third part:
When Luffy himself drew the new Jolly Roger for Joxy pirates, it kinda looked more Feline than Vulpine and one more thing to note is the Jolly Roger has torn left ear. Thanks,
@Sadistic Senpai for noting such minuscule detail.
Morethan anything Will of P is strong :P
Finally, dear carrot fans, do your best to jeer at me and create a shitstorm
