I remember reading an article a while back that said something along the lines of, "traditional Okinawan Kobudo derived a lot of power form the hips. Modern fighters use lighter bos, and especially when it is a male practitioner, rely on the shoulders for fast strikes." It then suggested using heavier weapons to try to force yourself into using the hips (as well as actually practicing doing so, duh).
Using the hips/whole body seem to line up with other parts of our style (Shorin-ryu), and I can see small hints of it done occasionally (i.e., a few strikes or when the higher-ups are really concentrating), however there's little to no emphasis placed on it.
My question can really be broken down into two parts:
1) Is deriving force form the hips really some lost or deemphasized feature in Okinawan kobudo?
2) Are heavy weapons a good way to try to cultivate this?