That's the trouble with knowing radio inside and out, but being clueless about actual music. In the recording studio, Paul Revere and the Raiders were hard rock pioneers.
In the studio, they would have had a hard time if it hadn't been for producer Terry Melcher. My 3-corner hat is off to Terry for making brilliant records on these guys, with great songs written by the best in the Brill Building. I'd agree that guitarist Drake Levin was a rock pioneer, but he & the rest of the band quit in 1967, leaving just Paul & Mark. Terry used The Wrecking Crew on their records.