Most NPs screw logic so hard that there's even no point in trying to find gaps on them. One of the free NP that I've ever seen that had an exploitable gap is Tsubame Gaeshi and serious gap is mostly Not!Kojiroh screwing himself.

Truth be told Musashi probably wouldn't even have won of he had fought Not!Kojiroh ok a beach unless he had Instinct as high as Arthuria there's no conceivable easy to avoid Tsubame Gaeshi while on even ground, that said, obviously he fought the man named Kojiroh, but not the man who could do the Tsubame Gaeshi or the man who wielded the Monohoroshizao.

Anyway, that skill is mostly useless, since little to no NPs can be exploited.