Zoro been saying he wants to go to the top for mad chapters now. Oda not just bringing it up for no reason. He get their by somebody throwing or get lost or whatever crazy idea Oda comes up with.
Zoro is currently stuck tag teaming apoo with queen watching over him. Along with the fact linlin is coming his way and orochi might be alive
All this happening as luffy is makin his way up to kaido with jinbe and sanji helping him by fighting off waves of gifters since the beginning
Even ignoring apoo, queen, king, orochi, linlin, etc potentially taking up his time and energy
The gifters and stairs will. We already saw it happen