As a side note of which I'm sure you're aware— as the Zen (Chan) tradition came to develop a sense of itself as a school, it took on the self-understanding that it was based, not on a text, but on a "transmission" of a "direct experience."
Intriguingly, the Zen school then of course came to record accounts of such experiences, appended poems and then commentaries to those, and ended up with its own sort of "scriptures"— the koan (gong'an) literature.