This is PCA of Lithuanian ethnolinguistic groups from this doctoral thesis.
According to this PCA Western Zemaiciai (who live in the territory of Memelland), plot somewhere in the middle among other Lithuanians.
North Zemaiciai (NZ in the PCA, blue stars), should be moving towards the direction of Finns, because they had most chances of mixing with Baltic Finnic people like Livonians. But they are not really... they stay in the West, some go South, some North ... (the Finns are somewhere East North)
South Aukstaiciai (SA in the PCA, purple diamonds) are more shifted towards CEU (Utah residents of Northern and Western Europe) which is expected, the Slavic people of neighbouring regions should be in that direction, too, more or less, probably.
It is a pity that the author compared Lithuanians to so very few other populations, it would be interesting to locate distances between Lithuanians and other different peoples, for instance, which direction would the Polish people be located, or to compare distances between Lithuanians and Poles from different regions in Poland.