Based on 'Juko Isshi Mokuroku' (Juko's diary about the method of judgment) in "Yamanoue Soji ki" (The Record of Soji YAMANOUE) (Nigatsu-bon), it had also been believed that Juko served Yoshimasa ASHIKAGA, 8th shogun of the Muromachi bakufu (Japanese feudal government headed by a shogun), as an instructor of the tea ceremony, but the results of current research on the history of the tea ceremony basically disputes this fact because the descriptions concerning Noami that are included in the same book are not correct in light of the year of his birth and death.
さらに『山上宗二記』（二月本）中の「珠光一紙目録」により、室町幕府8代将軍足利義政に茶道指南として仕えたともされたが、これは同書中の能阿弥に関する記述がその生没年と合わないことから、現在の茶道史研究では基本的に否定されている。