You may be right. I'm no expert, and have the greatest respect for Aubrey Burl. I just think the transportation theory makes more sense (and seems to fit in with other theories/myths as to their origin).
Im no expert either but the transportation theory seems fantastical to me, plus the erratics found and the boles barrow stone. ?
I know our ancestors were no fools but the trip from wales just seems impossible, by sea anyway.
I could believe the stones were erratics dumped elsewhere, maybe built as a monument elsewhere then moved to stonehenge, there is evidence of the bluestones having a previous use.