I was looking at theories and found an interesting one, Ryuma's kimono has symbols that look like Dragon's tattoos and a Kanji that says dragon and apparently Oda confirmed that Koshiro, Kuina's father is a Revo!?
I also ran into a theory about the Strawhats having more conquerors than the Rocks Pirates made by a candy that posts in this forum, it was really a "Lanji is a conqueror whether you like or not, whether you hate or not" (his own words!) fanfic, after reading it I felt like taking a crap, would read again.