What do I want from SC6?
Setsuka, Mina, Talim, Zas.
Give Pyrrha the Opyrrha/Sophitia set, simplify (and weaken) Pat's Apat set, and bring back Cassandra with an altered Pat-style.
Other than that? IN-GAME FRAME DATA. Oh, and a mission mode like Xrd that deals with situations and how to react.