On a sentence 

"Chams account for the greatest part of the erstwhile substantial Albanian minority in Greek Epirus; today, the population of only two villages north of Konitsa belong to a different Albanian subgroup, that of the Labs."

Isn`t this too big and irrelevant for the lead? I have added this info (because it shoul be) in [note a], but i think that this is irrelevant for the lead as too big and with no clear signification for this article. What do you think?