Mechanical aspects of technique are not all that pertain to mastering your art. The thing he is trying to teach Inshun is being brought to him through Musashi. It could be the same thing Takuan said to Musashi when he wanted him to see everything. Musashi right now has vision so clear that he can see the tiny veins on the hundreds of surrounding leaves that gather round for his battle with Inshun. That clearness is hiding from Inshun, and not because of negligence from In'ei or Inshun, but because Inshun has succeeded in besting all who challenge him that he has not had the opportunity to tap into the clearness with which his body is capable of.
