Why will Dajjal come from Iran?

As we know Dajjal will come from Khorasan. Chapter: The tribulation of Dajjal, the emergence of 'Esa bin Maryam and the emergence of Gog and Magog, Sunan Ibn Majah and he will be followed by 70,000 jews from Ispahan Chapter: The Rest Of The Ahadith About Ad-Dajjal, Sahih Muslim . But according to history, Assyrian's exiled the people of Kingdom of Israel which are 10 Lost tribes(Asher, Dan, Ephraim, Gad, Issachar, Manasseh, Naphtali, Reuben, Simeon, and Zebulun). Jews are expecting their king messiah from the progeny of David(PBUH) and the tribe of david was Judah from the southern kingdom of Judah(Which includes the tribes Judah and Benjamin). If dajjal come from area near Khorasan then he must be from the 10 tribes and historically the persian jews are not from the tribes of Judah The “Persian” Period . How the islamic theologians and scholars explain this dillema? I am studying the comparative theology for last 2 years. Can someone help me in this particular matters?