Kakari-geiko is a lighter form of sparring with a specific theme. Tori can either have an offensive or a defensive role, and the Uke can either have an offensive or defensive role, uke can choose to use movement, blocking or technique to defend against Tori’s attacks.
This exercise is used to create an understanding of different tactics and strategies, so even if both Uke and Tori is defensive they can’t quit attacking, because in a competition they would be penalized for passivity. For defensive judo it would rather be to work more with gripping, movement or other forms of defensive judo. Here you as a trainer still can play with the parameters used in yaku-soku-geiko, but you also need to take the parameters from the figure in count.