I am wondering whether MMX was based on faulty assumptions that light waves would behave like sound waves. 1) What if MMX detected a phase shift? It would just mean that speed of light is c and it goes through different distance, with or without Ether justifying the shift. 2) Alternatively they would not detect any shift even when Ether was present since speed of light is always the same as they do not behave as sound waves. It does not prove existence or non existence of Ether or constant speed of light. What am I missing here?