Nor are they amateurs who perform experiments that show alternate means of shroud manufacture.Yes, for the most part they ARE amatuers. They are not Forensic Pathologists, Anthropologists, or Physiologists. They are professional Magicians, book authors, and people with pet theories... all amatuers, all inexperienced at interpreting forensic data.
Unless, of course, by "professional" you mean "makes one's living on the shroud."Well, while a few Shroud researchers have made money by selling the books they've authored on their researches, they cannot be said to be making a living doing so... but some of the counter theorists can. Most of the researchers fund their research from their own pockets.
Hmm. What evidence of such a strap is there on the shroud?Evidence of chin strap: the Mouth is closed. The hair and beard are pushed forward somewhat.
Given the plethora of presumed details supposedly seen, the strap shoudl be pretty obvious.No, Orion, it's under the beard and hair... remember?