@Antmrm he was there at the G**'s Valley incident but that's not it. His revelutionary army has been the biggest thorn in the side of the World Government for a couple of decades at least. It makes total sense for him to be the most wanted man in the world. Nobody else has made the World Government bleed like he has. We haven't seen much of it but he's supposedly led successful uprisings all over the world, way before Luffy started liberating nations.
