Hmmm… I’m certain I didn’t make myself clear on this one.
First, conservative Christians with an adherence to a strong Bibliocentric doctrine, along with Orthodox Jews, are insistent on the direct authorship of the whole Torah (except for the short passage at the end of Deuteronomy) by Moses (whose death was added by Joshua, on this school of thought). While there is clear evidence of the J, P, E, and D strands in the documents as they stand, in my opinion, the longstanding reverence given the Jews to the Torah, even in O.T. times, militates, IMHO, against the “bunch of oral traditions written down and then shuffled together with poor editing” theory of modern textual criticism. Note that I’m not saying it disproves it; it’s merely counter-evidence one must weight in deciding whether to subscribe to it.
My personal “take” for some time, based on the clear presence of JPED texts and that reverence, is for four strands of text focusing on local-interest matters handed down from earliest times in separate locales (e.g., Judah, Ephraim, the early priestly centers and then Jerusalem) and then merged – with sufficient sanctity surrounding them that there was little or no “editing” but simply a “Harmonization of the Torahs,” so to speak, akin to the conservative Christian “Harmonizations of the Gospels” that report the text of all four but attempts to weave them into a single narrative. The E strand, for example, would preserve the Joseph traditions, the J strand the Judah ones, the P one the cultic ritual and the genealogies used as a “frame story” to the individual stories of patriarchs in Genesis.
Such an original text might (but need not) be ascribed to Moses but would vary according to what was preserved, the oral traditions surrounding the specific text, and so on. But it would have come from a single original source.
To me the computer analysis, if accurately done, supports this sort of interpretation. I do find it very suspect that the texts in question would have moved from “oral tradition subject to change” to “sacred Scripture to be preserved to the letter” in as short a time as the textual critics suggest happened.