Dragon has been dubbed as the most wanted man in the world and was shown as OP but only from an early series perspective, where Smoker was the one that admited not being able to deal with him. Seeing how the RA acts directly against the WG It makes sense for them to be even more wanted than pirates, as they are considered terrorists. First Big bounty raise for Luffy came after he went directly against the WG so se know how offenses are against them are considered a bigger threat. Nonetheless BB pirates alone were able to easily kick them out of their own HQ. Also their abilities seem usefull for guerrilla and infiltration tactics rather than for massive power of destruction. I think Dragon himself if claearly below admiral level and Sabo could be YC3 at most