One has to give it to Fujita… sneakily introducing the doubles in that panel a dozen or so chapters ago sets the stage beautifully for this chapter. And I guess this was all Rokurou's suggestion to the Kiritas?
Seeing as how both Kiritas kept telling both pairs of Takoha and Makoto to conserve their energy I feel like neither of them might be real, maybe they're all dummies like the one used by Oujin and they're somehow being piloted by the real ones.
I really like how the sisters have evolved over the course of the series. They started out really wierd and offputting but now they really feel like full fledged characters.