Grand Sensei Tomimori Kyozan (1899-1975) favored the original requiem honkyoku Ken Ko San. This treasured honkyoku became a tradition for the students of his school. Yushin has emailed that Ken Ko San was an original old honkyoku from the Soetsu school.
Ken Ko San is Sensei Morimasa Horiuchi's favorite honkyoku in the Taizan-ha repetoire.
The feeling within this and many other honkyoku honors the spirits of the departed.
Ralph Samuelson has shared that one of his favorite honkyoku combinations is Hi Fu Mi followed by Ken Ko San.