Another Idea

Going a little back in time, the twins' group reached the peak of the Space Bending Realm. Naturally, it was time to have a breakthrough. Sister Orb explained to the twins that the Elemental Space basically consisted in fusing one's Spatial Powers with one's Elemental Affinity. You would then use that fused energy to push your Dantian or Demon Cores into the Space Bending Realm.

From there on, their group would be able to choose whether they wanted to use their Spatial Power fused with their elements or use it separately. It goes without saying that the power of Spatial Related skills was much stronger when one's Elemental Affinity worked together with their Spatial Powers. 

Usually, such a breakthrough would generate a huge commotion. But since their group did that while inside the Soul Gem Dimensional Realm, nothing happened on the outside. Even Kentucky had come back just for that breakthrough.