Actually, I’d love to know where and when the folktale claiming that Jesus was the only man who was ever exactly six feet tall got started. Inherently unreasonable, not least because that unit of measurement wasn’t standardized until much later so even if true it would mean he would be more accurately described as some random fraction of some more contextually appropriate unit…
As far as I can tell, this was one of those westward-ho lay-preacher attempts to build a more complete religion when armed with nothing more than a copy of the bible and imperfect memory of sleeping through Sunday services as a child. They needed better arguments for why Jesus should be considered an ideal, and declared that he was “perfect” in whatever way the question was posed.
(Then again, that’s my explanation for a lot of American biblical-literalism fundimentalism, and I can’t support that opinion any better than they could support the exactly-six-feet-tall assertion; I believe it because I haven’t heard a better explanation for how things went so far off the rails.)