My guess is egg head, garp and Blackbeard side quest, law meets straw hats at elbaf They discover lode ponyglypgh somehow, either on elbaf or on egghead. From the way we have seen law and luffys journeys Clyde into one another so I think they will meet again. Right now what we are getting is a prelude to the war ark somewhere based after elbaf. I also think urouge will be there given what we’ve seen of him and his wandering around the world Next ark after elbaf is first a battle between Blackbeard and them at lodestar fighting for who will go to laughtale, maybe shanks is included here as well. If the government caught wind of three emperors fighting for the one piece all hell would break lose assuming they would want to prevent them getting to the one piece After lodestar would be a war ark between straw hats and friends vs marines before they find the one piece What is hard to theorize is how the series will deal with the marines prior to reaching laughtale as Oda has stated that when we reach laughtale the series will end