I understood your point and your reasoning for the critical order and that is why I stated that you most likely liked the end of On The Road more than rest of the book. (It is one of my fav. sections too).
Kerouac was not a master of Buddhism. Of course he wasn't. The drinking and diet always come up in this discussion. We must also remember that he was again a Catholic at the end of his life.
The evidence for Kerouac's meditation can be found in Dharma Bums, Desolation Angels, and Some of the Dharma (among others). He also wrote a bit about imagism and haiku and his ideas on haiku in the West. THis can not be found in Kerouac's Bio's because most of his biographers (in my opinion) have their own agendas and the OTR period is what sells books (as does his slow, tragic death).
Kerouac was not a "serious scholar" as you wrote, nor a "master of Buddhism", but those are not my points. My point is that he actually knew quite a bit about the topic for the time period and that much of that came from Snyder and Rexroth and some of it came from his own and Ginsberg's studies.