ok now if you have already gone and killed the whole sith base is their anyway to win the case against sunry?

Did you find the young Selkath in the Sith base

Which trial are you talking about? The Sunry Trial or the other one?

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.