Baylan Skoll is the most interesting character we've had in Star Wars for a long, long time. It's not yet entirely clear what his motivations are, but it's clear that he didn't want to kill Ahsoka, and he kept his word to Sabine even after he got what he wanted from her
A thread:





Here's Baylan's response when his absolute maverick of an apprentice Shin Hati asks what happens when they find Thrawn. He claims that while others get War, or a New Beginning, Skoll and Hati get Power.
He doesn't want War, and he doesn't expect a New Beginning for himself.

Before a full analysis of the #Ahsoka teaser can be done we need to solve its central mystery: Baylan Skoll and Shin Hati, and use that answer as the foundation of our guesswork.

I've wavered on who these 2 are for a couple days but I think I've figured out it now.
A thread: My guesses had ranged from Dark Jedi from the Unknown Regions, to members of the Lost Tribe of the Sith, to Sith from the Old Republic via the World Between Worlds, to Bane and Zannah themselves.
But I think ultimately the key is in their orange blades and what those symbolize.