Well, actually there are 3 lineages of the Mitose line of Kosho Ryu Kenpo. The one that is probably the most true to the original teachings of the "Official Self Defense Club" of Hawaii receives very little publicity because it's leader is not out selling videos, books, and cross ranking everyone that wants to join him.
The "Official Self Defense Club" still exists in Hawaii in a unbroken line from James Mitose to it's present head.
In 1953 when Mitose quit teaching, he gave the "Official Self Defense Club" to Thomas Young. Prof. Young affliated the club with Henry Okizaki's "American Jujitsu Institute". It became the "karate" branch of the A.J.I.
After only a year or two Prof. Young handed the club over to his student, Prof. Simeon Eli, who headed the club and the "karate" branch of the A.J.I. until his death in 1971.
In 1971 the "Official Self Defense Club" was taken over by Eli's senior student, Prof. Charles Lee. To this day Prof. Lee heads the "Official Self Defense Club", and is vice president of the karate branch of the American Jujitsu Institute.