The Darvin scan is a weak reference, as it still does not mean he's a qualified voice about Klingon anatomy or surgical processes. In TOS, McCoy even admitted never having operated on a Vulcan in "Journey to Babel"--
--and they were a familiar, member species. If--by that time, he was not experienced with surgery on a member species, it is a stretch to think he would know much more about a group never encountered in medical situations / research.Plus the fact I've never operated on a Vulcan before. Oh, I've studied the anatomical types. I know where all the organs are. But that's a lot different from actual surgical experience.
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