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>By far the strongest model for the development of the Synoptic gospels ever presented by Biblical scholarship comes from the extensive proofs laid out by Delbert Burkett in his 2004 books, Rethinking the Gospels, Vol. 1: From Proto-Mark to Mark and Vol. 2: The Unity and Plurality of Q. In Vol. 1, Burkett shows that even more instances of what originally appeared to be random jumping around in the Two/Four Source and Koester models is actually the result of editors switching between different source texts, combining smaller gospels into larger gospels, and not just by Matthew and Luke but also Mark. Although the idea of a pre-canonical Ur-Mark had been around since the late 1700s, Burkett is the first to provide compelling technical graphs to map out how multiple Proto-Mark gospels were weaved together by each of the Synoptic evangelists
>The Two Source, Four Source, and Farrer Hypotheses all accept “Markan Priority” because from a narrative and theological perspective, Matthew and Luke build their gospels on top of Mark, in that their gospels are longer with more teachings and miracle stories and more advanced theologies, but from the perspective of sentence structure, there are actually a large number parts in Mark's gospel that combine phrases found only in Matthew with phrases found only in Luke in the equivalent pericope. Taken by itself, this might seem like evidence for the Griesbach Hypothesis, but if we grant Markan Priority to be the certainty that Biblical scholarship has shown it greatly deserves, then the only other possibility is that Mark conflated a Proto-Mark source that Matthew used with a Proto-Mark source that Luke used. Burkett calls them Proto-Mark A and Proto-Mark B
