According to "Yamanoue Soji ki" in 1588, many utensils are listed as the ones that were owned by Juko and the necessity to probe possible fabrication of an oral tradition arose.
天正16年の『山上宗二記』に下ると、多くの珠光旧蔵の道具が登場しており、この間に伝来の捏造が行われた可能性を検討する必要が生じた。