I don’t have an encyclopedic collection, but I don’t hear the BNs as particularly conservative. They are generally more adventurous than the Atlantics (especially the early Atlantics) and about comparable to the 1971 Science Fiction sessions.
Separate point: it’s be an interesting essay for someone to write how for listeners/musicians of a certain age, the BNs and Columbias (and maybe Impulses?) were the main entry point into Ornette’s music rather than the Atlantics.
Another fun essay would be how when, in the early 80s you had the “neoconservative” turn in institutional jazz (Wynton/Crouch/JALC), it embraced early Ornette (through the first 1-2 Atlantic albums) and basically ignored everything that came after