The amount that Jones could theoretically improve this team is not enough to make a tangible difference. Even if we go so far as to say we completely replace Ayo or Coby with Jones, I don't really see us getting to say 50 wins as a result of that move. However someone with the skillset of like Dillon Brooks could potentially move the needle to 50 wins.
But again, PG isn't really something Bulls need right now. A player like the Warrior's Jonathan Kuminga or Cleveland's Moses Brown would fill needs on this team much better than Tyus Jones would. And for all intents and purposes, all mentioned players are probably not even available realistically. After all, if Jones is truly the best backup PG in the entire league, he's probably worth more than the MLE yeah? That's the most the Bulls can offer anyone.