Although thc standard models of rhetorical situation can tell us much about the elements that are involved in a particular situation, these same models can also mask the fluidity of rhetoric.
It seems like Edbauer is attempting to reverse what Quintillian did many years ago by compartmentalizing rhetoric, which in his mind would be a better way to understand it and practice it. However, rhetoricians have since argued that this has been problematic to the field, with which I think Edbauer would agree. In order to display a truer form of rhetoric, Edbauer wants to create a model that will showcase all of its aspects.