I taught a class at Bard College the other day subbing for a friend (musician on tour). She teaches an Experimental Music Practices course in their Curatorial Studies department. My focus being on avant-garde jazz, it was a lot to cover in 2 and a half hours!
I was asked by the students why I did not cover Sun Ra. My short answer is that he is a world unto himself but that's true for literally everyone I DID cover in the class. In order to go broad we did have to skip some of my favorites, like Mingus, Dolphy, Steve Lacy, Anthony Braxton, Archie Shepp, and the Japanese scenes (mostly for lack of available performance footage). Ra, for me, has a lot of baggage and though I like a large chunk of his music, I feel like it would be so easy to spend tons of time on him, and Cliffs Notes just would not do the whole context justice.
Short answer: they just need to give me a semester-long course.