Here is my theory for all the Characters post time skip, that we havent seen yet.
Buggy is a Shichibukai
Smoker is a Admiral, Admiral Shirohebi (White Snake)
Jinbei is going to fight with Luffy agains Hordi and Decken
Crocodile has started a new pirate crew
Basil Hawkins has fought Crocodiles new crew, interuped by marines
Aokiji is new Fleet Admiral
Coby has become a Lieutenant Junior Grade
Jewelry Bonney is in Impel Down
Marco is new captain of the Whitebeard Pirates
I couldnt be bothered doing the Supernovas. If I missed anyone you wanted, tell me what you think theyre doing.