"Tia says anyone can do anything but the possibility does not make evidence. That is about the flimsiest proof I can imagine."

No. The possibility renders your "evidence" worthless.

Or would you similarly argue that the Limbaugh song I linked to is a completely accurate depiction of him? Because the *possibility* of it being a cut and paste job does not negate the evidence, right?

I think you are greatly confused about burden of proof issues in general.