@Kusikawsay:
I like the fact that Tsuru made her way up to the top spots in a place where men usually are the leaders. It sounds kinda feminist, but have you ever noticed a female Admiral? or anyone in the World Government? The gorosei are all men. The admirals are all men. Sengoku is a man. Tsuru is the one closest to the top by her own efford.
Its not like I have anything against Tsuru… and now that you have provided your reasons, I too have gained a lot of respect for her. You are right though, I did noticed that in any group Oda has included a Female. Like Bonney in Supernovas, Boa in Sichis... we know there is an unknown Yonkou and there is a possibility that its a female, but not Marine top-tier. So, I guess you are right!!