Well if you walk across an existing sarsen drift (which, after all, is real solid evidence, not speculation) how often will you come across a stone that would be remotely usable, in terms of shape and size, as a Stonehenge upright or lintel? One in fifty, a hundred? Let's take a vote....
How many stones were used in Stonehenge? Multiply that by fifty or a hundred or whatever the vote indicates and that's the size of the drift there needed to be lying around to enable the monument's sarsens to have been sourced locally. And that very large drift, minus only the stones they used on the monument, seems to be entirely absent now.
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