The Ashkenazim intermarried later

Joseph Livni and Karl Skorecki have teamed up for Distinguishing between founder and host population mtDNA lineages in the Ashkenazi population. The argument here is that our ancestors did not form from Levantine men marrying Italians.

The mtDNA from nonLevantines is still there; I got some myself. The authors account for this by later admixture. We are after all talking about many centuries. The point is that our founders had already founded the foundation. Presently they can ascertain 54 Levantine female lines: not all direct (so again, not mine), but still in the genome overall. M33c (say) got there later but, by the luck of the draw, persisted a direct line. We introgressed Jews number under 15% of the Ashkenaz population, before modern intermarriage of course.

Khazaria sees such Asian intrusions as Khazar-mediated. Khazaria stresses that ancestrally M33c is not Khazar; it is southeast Asian, where Khazars were Turks from northeast/central. M33c rides with N9a3 which this website likewise cannot pin to the Khazars, although doing its best so to do. Isn't N more western?