Sucks that we never got to hear what Randy, Sarzo, and Aldridge would have sounded like together in the studio.
Used to have this old issue of Circus magazine where Ozzy was talking about exactly that, and how he was in the process of writing the next two albums. (which means someone was writing them, though I don't know who, because Bob Daisley wasn't involved at that point) He specifically mentioned that the albums would be called "Bark at the Moon" and "Killer of Giants" - although that would later become "The Ultimate Sin". And the song "Rock n Roll Rebel" was also specifically mentioned.
Ironically, this magazine was released the same week of the plane crash in 1982, so by the time you read the article, it was already impossible.
Still, you gotta wonder if any demos exist of that material with Randy playing on them. The only Bark at the Moon demos that I've ever heard (somewhere on YouTube) it was clearly Jake playing, but those were really just the rhythm tracks from the album versions.