SC: So, if you want to suggest it is an unproven hypothesis, go right ahead.
MA: No need to - you just did.
SC: And I have always stated the idea in our book is theoretical. What exactly do you think the 'T' stands for in 'RVT'? All explanations regarding these structures are hypothetical/theoretical. The RVT, however, is supported by much evidence and,indeed, better explains that evidence than does other theories.