Jian Wushuang did not know.
The eight Emperor Swords were extremely intelligent and they knew how to choose their Master.
Moreover, they were Emperor Swords which were born specially for the Emperor Sword Principle.
In the Emperor Sword Palace, they would not care about experts who practiced normal Sword Principles. Only people who had comprehended the Emperor Sword Principles via the sword grave had the right to be their Master.
For example, back then, the founder of the Emperor Sword Sect had managed to get one Emperor Sword to recognize him as its Master as he had comprehended the Emperor Sword Principle.
However, the founder of the Emperor Sword Sect's affinity for comprehension was limited. After spending one thousand years of time, he had only barely managed to comprehend the First Move of the Emperor Sword Principle. Hence, he had barely achieved the requirement for them to recognize him as their Master,
But what about Jian Wushuang?