Besides these questions, some see the difference between remarks and behaviors by Ninkan and Monkan and the creed in the Tachikawa-ryu school, and doubt the relationship between them and the Tachikawa-ryu school.
以上のような疑問のほか、仁寛や文観の言動と立川流の教義との間に差異を見出し、彼らと立川流との関係を疑問視する向きもある。