Even Denjiro warn the alliance about the Tobi Roppo, Hyo even said that they probably not take them down but stall time which show again the portrayal.
They are a great force for Kaido with is a reason why he want to show them to Big mom.
They are for sure monsters,the one tank a upperhand G3 and the other push Luffy to use G4 via strenght. People who believe low-mid strawhats can beat them 1on1 gonna get disappointed. They are right up woth Supernovas, league of Capone and co and I doubt people think that Franky or Brook can actually defeat Capone.