Is Avebury henge where it is because of the Ridgeway, or is it the other way round??

Time has flown by - the Ridgeway is just one ancient trackway, the henge would have served others from different directions. What would be interesting to explore, hearing Mike Parker Pearson the other night, is the whole area of Avebury as a place to bring the dead. Pryor called it land of the living/ land of the dead, in the Bronze age the dead would seem to live alongside the living their tumuli centrally/territorially placed in their living space. So how do all the neolithic longbarrows figure in Avebury, the same occurs in the Mendips with half a dozen longbarrows in close proximity, do they represent separate families, clans, tribes. If all the bones had been saved from these barrows would the DNA have shown some sort of pattern.....
and to answer your question I would say Avebury is where it is because of long-lived settlement and homing instinct to return to a place of sacred aspect..