Ender's explanation sounds pretty good. I never thought Leon was being controlled, more like the Emperor convinced him to work for him so that Leon could gain more power. Other than that, I think FFII's story goes a lot like Star Wars Episode V: Empire Strikes Back. Ender's list of FFII characters that correspond to Star Wars characters sounds pretty good, although I think the Cyclone was more like the Death Star than the Dreadnought. The comparison between Princess Hilda and Princess Leia sounds about right, though, since they're both princesses ranking high in the rebel army.