This quote struck me:
Actually, it isn't just historians of Buddhism who are finding flaws in convergence-to-a-single-root pictures of the past. The evolutionary tree model of origins is also under the axe in biology and other scholastic fields. For some time there has been a broad trend of thinking away from tree models of history,
Single root pictures. Just the other day I was reading about 30,000 year old dog skull. The idea was raised that dogs evolved in a number of places. No single root! Then we also read now how we are related to neanderthals, that in fact there was interbreeding going on between then and early "humans":
As I read the above article I couldn't help but see parallels to Christianity and its canon.
Things are tangled and complex. That's evolution, progress, history.