theory: Dragon was a Marine (an admiral in fact).
1. IN Logue town....smoker n dragon sounded like they had a past
2. most animes are based on mythology, one of which believes the ocean is divided in 4 (as is in 1piece). the myth continues that there r 4 mystical animals dat represent dem....these animals are some wat linked to the names of the admirals: in chinese mythology; the north sea has a Yellow Monkey, south sea has a blue bird and the west sea has a red dog
kizaru means Yellow Monkey
Aokiji means Blue Bird
Akainu means Red Dog
and guess what? the east sea misses a representative....n the myth states white dragon (i knw its sinking in), he is also from East blue...
3. why is he d most dangerous man in the world wen blackbeard has two badass DF n is tormenting d NW. My guess is it has something to do wif d void century (seeing as he attacked a prison to get to robin) +hez got dirt on the world government