Atyears ago, we find Neanderthals in Finland. Basque has also for a long time been leading in musical and other creative activities in Europe. The Aspie-biology group contains various biological traits that are related to autism. Language acquisition is different in autism. The Neanderthal group bonding likely looked strikingly similar to bonobos.
Former hearths are associated with some debris concentrations, but also found in isolated contexts; a consistent pattern of linkage between the two features seems to be lacking.
The Neanderthal theory
The common ancestor of the two versions dates more than a million year back in time. Outside of this range, age of death of LC and LF is becoming unrealistic. When first encountered, they used stone-age tools, lived in cave-shelters, and lacked many Neolithic inventions. The relative isolation in Neanderthal fits pretty well with a matrilinear, exogamous group structure, which must isolate itself to work. The exact time of maturity matters a lot, since skull growth in the measures used in the book beyond maturity falls 20 - 30 times. Therefore, Neanderthals most likely had fur.