Sects versus Scholarship in Buddhism
Once the Historical Buddha attained enlightenement or Awakening, he taught in sermons orated in the first person, so that the teaching was spread by memorization of the sermons, word for word (repeated in the first person) was teaching from the get-go that these teachings were orations from one's "self", as knowledge they already knew. How and who put these thousands of sermons into written words. that's where we start...