User blog comment:Monkey.D.Me/HAKI X haki = ???/@comment-4329230-20120104205916

I don't think there is something called strong and weak haki, its about how the other person use it ( for example : Rayliegh vs luffy before the time skip , reyliegh uses the haki luffy didn't have much time to use his haki so * BAM * ). its about the perfect timing I guess, and for the fourth haki naa I don't think there is, and if there is one why didn't rayliegh knew about it