That was after a 10 day long battle though. Give Homeless Emperor 10 days to cause as much destruction as he can, and it’d cover a much larger area than Punk Hazard
Top tiers in one piece are island level at least :
- Aokiji and Akainu turned the whole island into their DF
- Kaido lifted a huge chunk of rock
- fuji can lift all DR rubbles
- shiki can lift multiples big islands
- WB could tilt the whole water around MF and it was just the tip of the iceberg of what he could do and imagine that thing awakened
- Aokiji with ace age could link two islands
- Roger and WB was felt across all the small island and send wind strong enough to tilt the moby dick and it was just a small clash
and we’ve never seen anyone all out yet.
It’s clear that top tiers are way stronger than what Nichirin showed and stronger than lots of dragon.
But yeah above dragon and dragon + or unknown can destroy one piece verse