The bottom two are subpar at best, Trilla wasn't completely dedicated to the dark side, and the Grand Inquisitor already hated jedi and didn't have any indication of turing back to the light and was already blighted by Jocata Nu and the jedi.

Actually none

I mean the Grand Inquisitor is the Grand Inquisitor for a reason

I would say the Grand Inquisitor had the best chance

The grand inquisitor and maybe the fifth brother

It would have been a better storyline if 7th sister was Baris Offee - if that was true she would have been a great Sith apprentice

The Grand Inquisitor is The strongest one of them.

I think he has potential