Episode 909's remark

After the quest of rescuing Tama and rewarding Okobore Town. Luffy went with Law, Zoro and Kiku toward the ruins of the Oden castel. There they meet up with Kin'emon who should have went to meet them at the entrance, but due to unfortunate circumstances was unable to get out of the bathroom. Then they learnt that Momo and Dogstorm made it to Wano. As well as meeting up with the rest of the straw hats. Furthermore, Kin gathers everyone to tell them of the last secret they kept hidden. Turns out that the 5 Samurai: Kin'emon, Kanjuro, Raizo, Kiku and Momonosuke are people of the past that traveled through time to the present Wano Kuni. Also the spreading rumor of the ghosts of the Kozuki clan that are said to appear after 20 years to take revenge on Kaido and the Shogun Orochi.