No argument from me.
However, you believe Ryan & Pitman are correct.
Do you believe the flood was not global and not sudden?
What's all this obsession I'm reading about R&P trying to prove the Bible wrong? If one looks at the book, one finds that they simply suggested that the Black Sea flood may have contributed to the flood stories existing in the entire region within a thousand miles of the Black Sea.
As for the theory of a sudden flood, there is a great deal of evidence for it, and only this latest research in the Sea of Marmara against it. I don't see it as terribly significant.