Pull out the Miami Circle septic tank and look under it. Cross section some of the holes and compare the presumed tool marks on their walls with the tool marks apparent on the inside of the hole cut into the limestone containing the septic tank. When I visited the site, it looked to me as though metal tools had been used to dig at least one of the holes, as well as that in which the septic tank was placed. Find and excavate around Building 4's southern septic tank. Then select a sample of two other septic tanks, one each from any of the other five buildings, and dig them also.
Archaeology employs scientific methodology.
When faced with coincidences and mysteries, an archaeologist needs to eliminate alternative explanations that may not agree with his or her own. While I complain about the various cranks who were, and are, attracted by the circle, it is also important to note the many volunteers who worked to excavate and preserve the site. Whatever the circle is, or is not, it is encouraging to see so many people step forward when it seems an important archaeological monument is threatened. Because of the Miami Circle, a lot of people have learned a great deal about Native American history and now recognize that we must work together to understand and preserve that legacy.