Zoro: I'm too late...it'd be nice if I could just fly there but...
Zoro: regardless of what route I take, it won't be easy to get through
Marco: "Strawhat's crew"!!
You have your answer chrono-chan, marco is gonna bring Zoro to the top with robin and brook and King will appear to stop them and Zoro will say : "let me handle this monster, go"
If they take the stairs, they would have faced Queen but there is 0 reason for Marco to appear suddenly there showing his wings !
Better to accept it now Zoro vs King is on the way before 1000th