The Gandhi Gorosei seems to be in all likelihood, an opponent crafted for Zoro:
Given the above two points, it's hard to imagine Gandhi fighting anyone but Zoro.
Gandhi fighting Zoro heavily suggests the Gorosei are opponents for the Strawhats. Some allies might be involved, but it's hard to imagine a situation where the Gorosei are instead defeated by the Revolutionary Army or some other separate faction.
- He wields a Supreme Grade sword
- All the other known wielders of Supreme Grade swords in the manga are at the very top of the World
- Whitebeard
- Roger
- Mihawk
- Gandhi has been shown polishing and cleaning his sword
- All the other known wielders of Supreme Grade swords in the manga are at the very top of the World
- His sword is the Shodai Kitetsu:
- Zoro wields the Sandai kitetsu and indicated interest in the Nidai Kitetsu when he encountered it in Wano
- Even know, it's possible that he traded the Sandai Kitetsu off panel for the Nidai
Given the above two points, it's hard to imagine Gandhi fighting anyone but Zoro.
Gandhi fighting Zoro heavily suggests the Gorosei are opponents for the Strawhats. Some allies might be involved, but it's hard to imagine a situation where the Gorosei are instead defeated by the Revolutionary Army or some other separate faction.