You know, I'm not even trying to argue against Pedro joining now. But people really should think twice when using numbers as evidence so randomly like this. Do you honestly believe that when Oda was drawing chapter 270 and 540 cover page, he knew that Pedro would appear EXACTLY in chapter 810? Few months ago they said Reverie and Wano will happen in 2017 and now they're not sure anymore. What I'm trying to say is that even if Pedro joins, it has nothing to do with chapter numbers 270, 540(2*270) and 810(3*270). You should only focus on the content of the cover pages in general.