Three Powers
So I still don't really understand how the 3 powers balance each other.
We know that the Shichibukai members are all powerful, and the Yonkou are the 4 strongest pirates in the entire world. However, we don't know how many powerful marines there are, or what other forces the World Government have up their sleeves (like the CP9).
Also, the power of each Shichibukai member seems to vary greatly. I mean, Crocodile..seriously he wasn't really very powerful. He was powerful in the sense that he was perhaps in the top 5 percent of the total pirate population in terms of power..but there are ALOT of pirates and ALOT of guys. I don't understand the criteria for choosing the Shichibukai.
Another problem is whether or not the Shichibukai are under the World Government. If they are, then it'd be the two powers balancing each other out..the Shichibukai and Marines balancing the Yonkou.
And we don't know how long this system has been in place. Is Shanks/Whitebeard the original Yonkou? And is Crocodile/Doflamingo/Mihawk the original Shichibukai?
This system doesn't take into account the Revolutionaries either, or powerful pirates who aren't Yonkou or Shichibukai. Or powerful people who aren't pirates..like bounty hunters or mercenaries?
Also, about each kingdom who is a member of the World Government. How much power does each king / prime minister actually have? We havn't actually seen any national army except for Arabasta's.
So yeah..Oda has a lot to explain

So looking forward to the answers ^_^
<3 One Piece