Zou is how the ancient weapon pluton is able to move. Zou tows it around. Wano IS the ancient weapon. When momo opens Wano up then Zou will be able to tow wano to wherever it's needed to fight in the final conflict
Also, vegapunk will wind up on wano and he will power the ancient weapon with the power supply he's been searching for.
Also, vegapunk will wind up on wano and he will power the ancient weapon with the power supply he's been searching for.