"Sword Observation Manual," is way too personal!
But its approach is wildly unconventional, reaching an extreme!
It mainly interprets the relationships and transformations that arise from the fusion of the Nine Major Sword Techniques under the self-awareness of Bazhun'an, crossing and integrating various realms to push towards the end of the path, attempting to knock on that door.
It begins on the ground, but only offers a pole and says "climb up," then proceeds to hack its way through the clouds above.
Heaven is high and Bazhun'an is indeed not undeservedly famous!
Of course, the concept and the actual manual itself cannot be compared; to even manage to somewhat correlate them without drawing a conclusion is terrifying enough.
A genius's way of thinking must be peculiar.
To expect Bazhun'an to write a perfect foundation for the Path, he's likely to simply respond with "I've written it."
If you inquire further.