It's worth pointing that Issho is based on Zatoichi, a character who make himself seem weaker then he actually he is, that everyone keep underestimating in the movies and series. His whole character is the opposite of flexing on the weak. But I don't doubt that when Fujitora face someone he deems worthy, he'll show some of the coolest feats in the series. Don't underestimate gravity and blind old men in japanese media