Multi-regionalism and Probability

I want to see the proof that H. sapiens could in fact interbreed with erectus, neandertalensis, and heidelburgensis. Or for that matter, that erectus and neandertalensis could inertreed, or that erectus and heidelgurgensis could interbreed, or any other combination (seeing as how the MRH requires them all being able to interbreed, from what I understand).If you cannot show that they could, then MRH is dead in the water from the get-go.Further more, where is the oldest H. sapiens fossil located? The oldest cro-magnon fossil (modern man)? If H. sapiens arose independently through all this interbreeding, shouldn't we find ancient H. sapiens in more than one place?Did this multiple-region speciation event occur simultaneously? How can you tell? If they didn't, how can you tell that it isn't just H. sapiens replacing the elder species?Also, if the MRH is true, shouldn't there be more than one line (everyone today is related to a single ancestor, based off of genetic studies)?What about Y-chromosome data, which shows a similar OOA trend?

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Slight problem there, with the humanzee. Chimps have two more chromosomes than we do--48 (we have 46). Oliver had 48 chromosomes. He was full chimp.The biggest problem with MRH? IT requires interbreeding amongst the various Homos. We have no way, as far as I know, to determine if the offspring would be viable, never mind that they actually did cross. A hypothesis is worthless when grounded in such unprovable assumptions.