This theory is a sort of sequel to another one of my theories - 'The Voice of all Things & The Music of the Universe'. - This theory will expand on some of the same ideas discussed in that theory.
If you're interested, you can read that one here -
Ever since we found out that Aokiji had left the Marines we have been wondering what his future role might be.
We later learned that he had decided to join Blackbeard. But why did he do this?
The answer may tell us what his future role will be.
When Aokiji appeared in Punk Hazard, he reassured Smoker that he was 'still himself' & that his reasonings for doing what he did was so that he could operate without the restrictions & oversight of the World Government.