An 'Ahsoka' Theory Is That This Inquisitor Is Sam Witwer's Starkiller
The guy you see above you is Marrok, an Inquisitor, if not the last Inquisitor, who joins rogue mercenary Jedi Baylan Skoll and Shin Hati. He has an entire fight with Ahsoka herself using his signature spinning Inquisitor saber.
Source: forbes.com