jon1985,
>the whole area lines up with the winter, not summer solstice

I've always been of the opinion that midwinter was the most important time, due to the desperation of the thought that the sun might never return.
Take the Stonehenge Avenue - why walk up the Avenue, then turn around to watch the midsummer sunrise? I doesn't make sense. You walk towards what you are expecting. The Avenue would lead you towards what you came to see, i.e. the midwinter sunset, especially if it was processional towards Stonehenge.
Why is the Avenue curved at the far end (furthest from Stonehenge) if it's meant to point to the midsummer sunrise? A curved track doesn't point, it leads (in this case to, or from, the river).
I think the evidence now hints to a winter festival in the Stonehenge district. Any evidence of the summer feasts at Durrington Walls could be explained by an excess of summer products - make hay whilst the sun shines - in the form af a summer binge. Of course they would have made sure there was plenty salted away for winter first, so maybe the summer months were plentiful in those years.
What d'ye reckon?
Regards,
TE.