He's here. I don't know how, but it's him. Kalla sent out to Tonatius, and as if on instinct, she rushed in Tavaryn's direction, hoping to aid him against who she was sure was Tyrannus. En route, she activated her lightsaber and cut her way through the Sith's soldiers, whatever they called themselves.
The two Echelon 5 managed to sneak aboard the walker via a hatch on the underbelly, and were quickly making their way to the cockpit. "What the Sith doing with an AT-AT? They were retired decades ago."