NOW LISTEN UP, KIDS!
Here's how it works:
Dragon represents the revolutionaries of the world, just as the Freemasons do in our own world. They were responsible for starting the French revolution AND the American revolution! His tattoo pattern is actually a reference to the famous "Square & Compass" logo of the Freemasons!
He is opposed to the World Government, and therefore, back when Boa Hancock was his lover, she got a logo which replaced the World Government's logo with that of Dragon's, symbolizing the worldwide takeover of the revolutionaries!
…Which is Luffy recognizes the logo of his mom and dad.
(You may praise my brilliance now.)
PS. I don't give a shit if these threads have been getting locked, it deserves a thread and the main discussion page is full of off-topic shit like the 10 week rotation thing, with nobody even talking about the chapter anymore.