I've been taught that the weapon hand and the empty hand are interrelated; the same principles that underlie a good empty hand technique are present in the weapon hand, and vice versa. For example, many short stick strikes are very similar to basic punches, with slight changes due to the nature of the stick. In theory, you should be able to perform any weapon form/technique empty hand, or any empty hand technique with a weapon. Of course, reality and theory aren't in total agreement; some things just don't work well when you do that -- though sound principles of stance, body angle, and body dynamics are the same in each case.