The Tracy lineage people, and Chinese Kenpo organizations still have Mitose and Chow in their lineage. I heard from Edmund Jr., and from Mr. Parker the same thing that Doc is relating.
Just some additional perspective. By the time I moved from Chinese Kenpo to American Kenpo, My lineage changed from Ed Parker, to my teacher, to me. This did not discount Mr. Chow, however by the time I started, Ed Parker's Kenpo Karate, (not "American Kenpo") was only about 10% of what it was in the 50's, and 90% Mr. Parker's innovations and revisions, with the additional input he received, part of his genius was in synthesis, and abstract revision into what it is today. A live, growing art.
There is lots of information re: James Mitose and the Tracy's have some extensive articles on their side of the story on their websites. Just search MartialTalk for "Mitose" and you will get an eyeful.
Respectfully,
-Michael