User blog comment:Powerhouse411/Who Are Your Choices of Shichibukai?/@comment-24070327-20140206091849/@comment-24070327-20140206173225

Heh. Never considered becoming a Shichibukai to be the same as losing as Admiralship. From what I can tell, most Shichibukai don't actually lose control of their forces after they join the group and most of them don't really have to DO anything except during times of war. I figured that Lucius would jump at the chance because it'll make the World Government leave him be while sets up his plan. There really isn't much for him to lose unless some kind of war breaks out. And even then he could just attend himself and leave his troops by their lonesome for the time being.