Kakie is for developing sensitivity but also it develops "muchimi". This is a heavy-stickiness associated with Goju Ryu techniques. It strengthens the shoulders too! :erg: Man does it hit the shoulders! The techniques are added to extend the muchimi into the defense.
There is stationary kakie and it graduates to moving once you grasp it. After a while you can change while in the motion, from right to left, left to right, while moving. It is a very dynamic training.
K.