There had been some theories that the Shinano-Ogasawara clan served as the master of kyuba of the shogun family, Sadamune served as the master of Emperor Godaigo and Nagataka served as the master of Takauji ASHIKAGA, but those are sophistries without any evidence of historical materials.
なお従来は、将軍家の弓馬師範は信濃小笠原氏が務めたとされたり、貞宗が後醍醐天皇の師範、長高が足利尊氏の師範を務めたなどの説が流布していたが、これらは後世の付会に過ぎず史料的裏付けに乏しい。