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If the bluestones are glacial erratics, that pre-supposes that absolutely every bluestone that was deposited in the wider Stonehenge landscape was gathered up by the Henge builders and incorporated into one or another monument unless, of course, anyone has yet identified bluestones on Salisbury Plain that are both verifiably independent of any human agency and clearly within a morainic context.
With sufficient time and resources (oh yes, and funding), all logical and credible routes from the supposed source quarries could be explored to search for stones that didn't "make it" to Wiltshire, including those that inevitably were lost in the sea or river journeys. Just one bluestone found in isolation from its geological context would be sufficient nail down the debate.
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