JD: From the perspective of a Jehovah's Witness the bible does justify shunning
Right. Again, that is only because this is what they are TOLD the bible says and--more importantly--what they are TOLD it means.
Eden demonstrated there are alternate interpretations. That is just onepart of his evidence based argument.
Fundamentally however, to persuade a JW to abandon his acceptance of shunning as practiced by JWs you would have to undermine their faith in the Governing Body as God's spokesmen/representatives on Earth and/or their faith in the Bible.
As important as those are, this is not part of his thesis. Perhaps in a concluding section of his essay, Eden could raise the issue that since the GB have this wrong, maybe they are wrong about other things, especially their role as G.O.D. (Guardians of Doctrine). This would be a good segue into Geoff Jackson's admission to the ARC that it would be "presumptuous" to claim that they (the GB) are God's spokesmen.