But there's nothing in that to particularly suggest human transport didn't happen.
A bit more here - http://www.history.ac.uk/ihr/Resources/Books/02625253.html
"The dichotomy between English and Welsh dolerite bluestone implements could be explained by exploitation of different Preseli outcrops or erratic assemblages derived from them. ...... Previously published analytical data in combination with the new implement/outcrop comparisons presented in this paper support derivation of the majority of analysed Stonehenge monoliths at one particular outcrop within the group of four identified by Thorpe et al. 15 years ago. "
Same comment really. On that basis it could have been either means of transport.