Well then as to whether Bird or Diz was more important. . . I think Bird was a bit more important for the musical content. . . he'd soaked up the KC innovations of Pres and he'd also soaked up the harmonic inventiveness of Tatum and others. . . he was all about the music, and his dedication to his art and the virtuosity that both came from that and was a deep part of him regardless were a very important force in the new music.
Not that Diz didn't contribute musically as well (and he was also a virtuoso, and both he and Bird helped to introduce important--different---rhythmic changes, among other musical matters), but most important was Diz's contribution as a showman, as a catalyst, as a spokesperson and trendmonger in my opinion. He visually became bebop to the masses, and he had the big band and the film shorts and the jive to promote the music as "the hip new thing."