It is all in the indivisual. Traditionaal gong fu or mma or jkd, does not matter. Look at Bruce lee, he worked very hard and was probably in excellent condition, then there are traditional people who are also in excellent contition, like hung gar people who can get into those ultra low stances. It is also how a persons mind and concentration are. Does the person do forms ferociosly or do they just dance around and repeat movements, does the jkd person throw some jabs and crosses or are they putting their entire concentration into it. It is all in the individual, their natural talents and abilities, their training habits, and frankly where they are at that day. there are times when i feel If attacked by anyone i could take them, then there are times when i am soooo tired i feel an unskilled person could defeat me. I know i am wrong when i am telling anyone that what i do is better than what they do.