You know,while it makes sense to rank them base on who is closer to Sun (and to the placement in their reveal) , there is also another possible ranking but far less likely. .
Luffy is the sun.
No gorosei is named after earth.
Imu is the creator of the world to them,so he is earth.
the two closest to earth would then be venus and mars.
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Anyways since I believe that topman will be the Strongest. The win will go to the Monkey D family. Dragon needs to actually to do something against the Gov.