There are a couple things I find interesting with regards to Pleiadians.
Gabriel, the mythical archangel, was described a few times in the old literature, particularly the islamic literature, of appearing a blue eyed blond haired nordic humanoid, which fits exactly the description of a Pleiadian from abductee and contactee cases.
Another is their resemblance or rather link to the vril society and occult groups of the nazi era period. Gathered with Adamski's photographic case closely resembling the purported experimental nazi saucers
Haunebu.
Adamski claimed they were Venusian.
Could they have been of an advanced human secret society?