Dark King Silvers Rayleigh

Hmm, I think it is too early to know anything about Rayleigh's past. That or we'll never know about his past at all. Though some say, he is known as the "dark king" because of a type of "haki" we have yet to learn. A "dark" type of haki, something people are guessing right now an ability Zoro will also obtain. So basically, if you imagine, Luffy, or Gol D. Roger, having the "kings haki", as they are happy go lucky type of characters, then you have "dark kings haki" from the people containing a personality, Zoro and Rayleigh may share. Quite an interesting idea above . People on "narutoforums.com" have a guess known ask "saki" some sort of killer instinct. The idea for saki according from the forum is the ability to kill somebody using haki. So even though Haki is more than just people feinting, saki may be able to go even further and actually kill them. Also an interesting idea above. Those theories or, the writers just made his name cooler by adding dark king, also a cool idea ha ha. other theories: He could have been a king or royalty in the past, and becoming a pirate or joining Gol D. Roger, made him a dark king, someone who betrayed his people. Other theory is, perhaps it is the translation of the name, from old Japanese tradition to new. (I never really understood this one, but I think they meant a symbol in the writing of the original Japanese Characters made it into "dark king".