The same theory would usually result in different technological skills. Being a Universal Civilization did not mean that they were omniscient. Just like how the three Universal Civilizations could not grasp each other's specialty technology, the various civilizations would have a technological skill tree that was unique to themselves.
Han Xiao was familiar with the special skill that the Kunde Race had displayed. It was a technological skill called Spacetime Splicing Technology. It was a branch of spacetime theory.
Spacetime skills were extremely advanced, but they were not rare. The three Universal Civilizations and the various Star Cluster Civilizations had all grasped a certain degree of spacetime technology. Even the Mages had some spacetime related spells.
However, the Spacetime Splicing Technology also had its own uniqueness.
