Eh idk about the bottom half but the original idea of the story was to focus on Luffy vs the emperors so I do think it’d be fitting if he beats them all
- Luffy vs kaido in wano
- Luffy vs big mom in elbaf
- Luffy vs Blackbeard post elbaf
- Luffy vs shanks (allied with buggy) as the final emperor
The order not being based on strength but just what I think would be fitting imo
With luffy possibly fighting one of the 3 original admirals between each emperor. Tho not necessarily getting there own arcs
So basically
- Kaido
- Kizaru
- Big mom
- Aokiji
- Blackbeard
- Akainu
- Shanks