One fact that has not received adequate attention is that the provenance of the picture. It emerged for the first time last Saturday in a posting of a certain "GodAlmighty" on a fringe internet forum. If you were curious about where "GodAlmighty" found the picture, he* says "A Facebook friend of mine posted a pic. He knows his Koine pretty well and he says it's definitely from Mark 5:15-18." (The picture has since disappeared, but the post is still present).
As far as I am concerned, this settles the question. So often we are faced with artifacts appearing on the antiquities market with unknown provenances, or vague tales about their being found in caves somewhere. Not here. The artifact is from no less a source than GodAlmighty himself and his Facebook friend who knows some Greek. What more do we need to know?
* I am not here assuming that GodAlmighty is male but rather inferring it from his long beard, clearly visible in his avatar.