We know for sure that 1 Admiral is not enough thanks to Green Bull...
What we can assume is that the minimum is now 2 but I would say that we are still being generous with the admirals...
Zoro can go 1v1 against Fujitora or Green bull easily, Luffy can go 1v1 against Kizaru or Akainu easily, Sanji and Jinbe together can go either way against another admiral...
With that we have 3 admirals being stopped, with that we can account for the fleet of Straw Hats that they obtained in Dressrosa, and in addition the strong ties they have with the samurai of Wano who literally have an eternal debt with them, adding the army revolutionary with the influence of Luffy's brother who has been growing to the point of being called the emperor of flames, it is no longer just any villain threatening the Straw Hats, at that moment they can wage war on equal terms against any organization of the world.