This arc feels like its just halfway there....Yet soo much stuff that is not adressed yet.
-The giant skull everyone is fighting inside, what is that?
-5 flying six, 1 worstgen(hawkings is still kicking, right?), 2 YC, 2 Yonkos and perospero still need a beating, meaning thats at the very least 11 "elite" enemies for the fight to end.
-I doubt the whole shimotsuki plot with the Fox has been resolved, Oda never introduces such plot hooks just to abbandon them, SPECIALY considering Zoro comes from a place called shimotsuki village.
-We didnt saw much of Ryuma past yet, and again, Oda is not the kind of writter that leaves these kinds of important characters unnadressed even if they already died centuries ago.
And thats just what i can remenber on top of my head.