Nothing new in Eisenstein but those two pages comprehensively review the current state of research.
The conclusion of Lalueza-Fox is anything but obvious. The children in a group, both those who leave and those who stay, are mitochondrially no more related than their mothers are. More precisely there are of course childless women and those with a lot of children, so the next generation will end up slightly more closely related than their mothers. But that tendency won’t accumulate but will be reshuffled with each generation of mothers. For all men in a group to have the same mitochondrium, as here, they need to be brothers. A common maternal grandmother is ruled out, if the intervening generation of women is scattered to the winds. So either this find is pure coincidence or the conclusion is wrong in its generality. Or am I overlooking something?
Here’s the link to this week’s complete list.