Doesn't portrayal them equal, as example Luff moveset and higher end attacks are far stronger, he one shoting a lvl 1 fodder with his G4 attacks and actually Franky one shot it a lvl 1 fodder doesn't make them equal. In the case I doubt radical Beam would damage Doflamingo as Kong Gun did.
Also the case why Luffy attacking the numbers seems important.
Franky Shogun get actually take damage by Baby5
Franky and Usopp shit their pants by just watching big buys(Sanji and Pageone) fight each other:cheers: