I didn't forget, I just wasn't anticipating Spanish from you - my bad, but the bunny stays.
I would say ball and dummy done properly trains the all 8 fundamentals of marksmanship. That is one of the reasons it is on the "Most Excellent Drills" list in my Magic Field binder.
Besides looking like an idiot on the snap cap - you will miss on the live round if you don't apply the fundamentals. So you get the best of both worlds and in that sense, it is better than dry fire, which is my next favorite way to work.