Can’t be since we know that Rashi and the Baalei Tosfos shtam ben acher ben from Dovid HaMeclech, hence Shevet Yehuda. We have the complete yichus brief from Dovid HaMelech through Rashi. And most Ashkenazim shtam from Rashi. Hence the Ashkenazim clearly and unambiguously shtam from and are Shevet Yehuda.
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