I wouldn't be surprised if Kin'enmon was the only one who still knows Yasu.... or in plot-twist case, also doesn't remember him xD Maybe until some event triggers them to remember who he actually is... :thinking:
Also, what does it matter whether it's a filler or not. I'm still enjoying fillers in One Piece. But this episode really doesn't feel like a filler at all?
but they can gather more allies like this because orochi would order the people with a crescent moon on their ankle to be arrested and put in jail but those who haven't gotten the flyer yet would also be arrested and they could break them out of jail with more allies