Gung-Fu is like any other skill, such as a guitar. It takes many hours of practicing scales, runs, riffs, etc before one can improvise, or jam on a simple I,IV,V Blues progression. Then there are the Steve Vai's of the world, who shut themselves off in their rooms every day for ten hour practice sessions until the instrument and their playing is a total expression of themselves, spontaneous outpouring of emotion from the soul directly out into the fingertips. To know your instrument so well, that if there is a sound in your head, it immediately is able to come out in your hands on the instrument-that is mastery.
My Gung-Fu is like my guitar playing. I can jam, and I have moments of spontaneous inspirational flow. But, I do not know the entire fretboard. I cannot do a "C " scale in every position, find any note at will on the fretboard.
But from what I know well, my chops-when I find my groove, I can wail.
So..I am not a master. But some things I can do very well.