One thing that needs to be corrected. I never said that Israel overthrew the Assyrian empire, I just said they and Medes whipped the Assyrains hold them captive.
NonJews can trace their lineage to 721 BC? Really? 
He doesn't know what he is. His identity is lost. You pointed that out yourself.
The identity of the individual tribes has been lost, but the knowledge of who is a Jew and who is a Gentile still exists.
Gentiles can trace their lineage and it isn't to the 'Lost Tribes', who are suppose to have made a migration (never recorded) after overthrowing the Assyrians (never recorded).
One thing that needs to be corrected. I never said that Israel overthrew the Assyrian empire, I just said they and Medes whipped the Assyrains hold them captive.
NonJews can trace their lineage to 721 BC? Really?