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This is just a theory but what if Dragon is leading a revolutionary army because he knows the secrets of the 100 year void in the series. To my knowledge about the series and from Gol D. Roger's vice captain they learned the secret right after they got to Raftel. It would also explain a little why Dragon help Luffy in Louge Town not only was Luffy his son but because he regonized the same spirit in Luffy as in Gol D Roger. Like I said just a theory with no evidence to back it up