With Yoda, you must have 5 jedi at 7 stars to max him out. I can appreciate that as a means to keep people playing. Good dev decision. I was trying to think about what other events could be added to alternate with Yoda. I thought of using the 5 empire trooper characters:
First Order Trooper
Only thing is, I can't think of a quality trooper toon as a payoff? General Hux perhaps?