What if John wrote first?

In Star Wars: A New Hope, the character Han Solo was confronted by an intimidating bounty hunter, Greedo. In the original cut of the film, Han shot Greedo before things could get out of hand. This fit with the anti-hero arc, Han was the scoundrel with a heart of gold. In later recuts of the film, Greedo shot first. And so in nerd circles, people lament, ‘Han Shot First.’

And this raises an interesting question, what if John wrote first? I’m actually of the opinion that Matthew’s gospel was written first, but Paul Anderson (among the few scholars who read and digested J.A.T. Robinson’s The Priority of John) mentions a startling line of argument:

[I]f John was produced in an isolated region, it may be easier to infer that three traditions [Matthew, Mark, and Luke] might have overlooked John than to believe that John has overlooked all three of the Synoptic traditions.

The rest of the paper is okay. If that idea catches on, it would be great to hear Bible scholars lament the death of their elaborate source critical theories, “Mark wrote first!”