i didn't make a hierarchy between those 3, i meant to say part of the 3 main antagonist.
But no Akainu is not more important than BB or WG/Gorosei/Imu.
yeah they can be leaders, nothing say they are Akainu strong. Being a leader doesn't mean you are strong, they can school Akainu all day because 1) he can't do shit to them because they are the highest authority of the world, 2) they have tons of experiences.