Overall we will leave wano with more questions as when we enter it. Everything feelt so rushed, here I found a list and want to add few things:
-Shimotsuki lore
-Ryuma background
-Zoro connection to wano
-Why momos fruit was considered a failure
-Poneglyph
-Nidai kitetsu
-Caribou in wano
-Tenguyama real identity
-Big mom pirates
-What die Kid steal from BM and which commander he injuried
-Why kaido wants to die
-Onigashimas real name
-Meaning behind the big Skull in Onigashima
-Kaido connection to Onis, where he brought up the Numbers
-Why wano was closed off
-Why wano is called the city of gold
-Why kaido knows who joyboy is
-Why Kaido want to kill himself
-Kaido and his crew background story
-Kaido and his top guys don't having awakening
Probably even more infos are left.
I feel like in terms of writing, wano was Oda worst work since it had so many plotholes, so much content left.
It really feels like the arc ending unfinished and rushed.