User blog comment:Ace's Legacy/Revolutionary Hierarchy/@comment-30127592-20180112231445

Considering they're supposed to be a definite threat to the World government, I'd put the revolutionaries as a whole at the same level as a Yonko + extended crew. However, most of their "operations" seem to happen underground, so i doubt their general forces have the same strength as a Yonko's. I can see Dragon being yonko level, and Sabo's already shown he can compete with an admiral/top commander; but unless we see more feats i'd say most of the revolutionary forces are specialized in intelligence or underground operations, not combat.

I can see them taking on a Yonko (though i doubt it will actually happen in-story), but not straight-on: I imagine they'd infiltrate and sabotage the Yonko's territory, defenses and crew, setting him up to fall before finishing it with an attack