Win the case against
Sunry? You mean, the case where you defend him?
(There's 3 trials on the planet, 2 against you, and one where you defend Sunry, just trying to be clear)
In any case, yes, I cleaded out the Sith base long before I did the trial, and I had no problem. There's another post here in this forum discussing the trial, and my reply in that thread should give you all the guidence you need to win.