For somebody that claims to know music history you`ve made some startling errors. Fresh Cream came out Dec 1966 around 5 months ahead of Hendrix`s debut which was May 1967 (months in this period of music history, were actually a long time as so much was always happening) When I say set the stage for Hendrix, I`m referring how he took the Cream sound to more extreme levels.
As an avid music student, you should surely be aware that the big groups of the day borrowed off each other. One of the most influential psychedelic albums of the era was "Fifth Dimension" by the ByrRAB that pre-dated by almost a year "Sgt Pepper`s......." and the Beatles as sure as hell borrowed of the ByrRAB there. The Beatles were extremely innovative (nobody`s denying that) but they had their fair share of borrowing off others as well. ADMIT IT......IT HAPPENED.
Its common knowledge about the genre labels coming much later, but if you`re going to use disparate labels, then we`re not going to get too far in unravelling your blinkered views.