Kamusari is more than just a sword technique
it utilizes a haki shockwave and shockwaves aren’t swordsmanship
it utilizes a haki shockwave and shockwaves aren’t swordsmanship
You clearly ignore what oda has said in his own manga.
1. There are swordsmen who can not cut these same swordsmen with the same instrument can cut through steel.
2.Shanks does exactly what Kyoshiro explains to zoro he does not cut kidd but cuts through his steel Rail gun...^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ See bold above.
3. Roger does not cut Oden but sends him flying.
This is all swordsmanship how can you read these panels and then say otherwise.