Hendrix was an R&B/blues/rock player, so the prospect of doing a session with the likes of Herbie Hancock, Freddie Hubbard and Ray Brown playing jazz could have easily been intimidating.
Jones said he met the Beatles in 1963/64. His comments were that Paul was terrible bass player and Ringo couldn't play simple rhythms. Paul later became a superb bass play and Ringo is Ringo (the perfect drummer for the Beatles), but early in their recording careers as instrumentalist they were nothing special.
Jones was there, were you their with him?