This offshoot to the thread topic begin in a particular context relevant to the thread but has now since grown beyond it. We could take up the general topic of whether competing mutually exclusive theories can both have supporting evidence, or in other words both be "backed" by evidence, whether in law or in science, in a more appropriate forum such as Miscellaneous or Sci/Tech.I see that the real problem is that we don't have the same definitions of these concepts.