the main flaw in the entire theory of stonehenge -this time- representing the jaw/oral structure is that it isnt important- think about it, how often do you go about even knowing the interior anatomy of your- let alone anyones elses'- oral cavity- its not important to know nok (unless you a memeber of a orthadontic profession), and even less impoirtant the farther back you go- while genitalia are held in high reagrd throught time and history- its importance, that of giving birth to the next generation- is unquestioned and revered even in our time
combine this with the fact that it isnt likelly that the jaw is astetically pleasing, nor its structure well known, despite how easy it is, makes the case for it being its design flawed to say the least.