The Utah case reminded me of Timothy Good's Colorado ranch case (see "Alien Liasons"). Similar phenomena were reported at the Colorado site that shares a geologic border with Utah.
Knapp suggested that perhaps there is some kind of interdimensional portal, a "window" if you will between dimensions that allows entities access into our world. I think the same may be true of the Kelly case. Though the Kelly incident offered much less phenomena as compared with the others mentioned, the arrival of the entities seems to follow a similar pattern.
Though Edgar Cayce stated plainly that there was an interdimensional portal in one of his readings, the idea of an interdimensional window is still a theory today. But quantum physicists would likely support the idea as they have offered us a new look at our world with their interdimensional String Theories and Worm Hole Time Travel hypotheses. It may be a theory, but it's a good one -- one that seems to fit the facts.
Origin: faces-on-mars.blogspot.com