Just wild speculation on my part.....but he if he was not a living eyewitness to all of these supposed long drawn-out historical machinations, deletions, redactions and whatnot, wouldn't that make his theories as specious and apocryphal as those he is criticizing? I mean what makes his word better than the supposed person in the supposed time and place when it was supposedly penned? And more trustwothy than that of the copyist?What he is about is being a purveyor of the truth as to how the bible came to be.
Just thinking out loud here, mired in my Stygian ignorance.