VicP,
I find the idea of the funeral procession from Durrington Walls to Stonehenge, via the Avon, to be plausible. The theory of the wooden monuments being for those of the living, and the stone monument being that of the dead has a certain logic about it.
It would also explain the role of the Avenue as a processionary approach to Stonehenge, towards the "Altar Stone", i.e. towards the receptive trilithon horseshoe, and towards the midwinter sunset, the darkest time of the year, representing death.
It's only an opinion, but that's what makes archaeology great, the fact that we can all have our opinions without knowing we are 100% correct, and makes for good, interesting debate.
Regards,
TE.