This will probably rub a few people the wrong way but I believe Ezra fell to the dark side after vanishing with Thrawn. I believe Thrawn has copied the Empire to a T but has made his own improvements to it. I think he created his own Inquisitors and expanded on their function and purpose. Likely these inquisitors will be more dangerous. My thinking is that Ezra was tortured by Thrawn and bent to his will but he's not just a regular Inquisitor. I think Ezra either serves as Thrawn's own Vader or as the Grand Inquisitor maybe both.

I think one of two things will happen an Ashoka will get Ezra away from Thrawn and deprogram him or Ezra and his inquisitors will take over Thrawn's empire and Ashoka will end up seeing him go down a path similar to Anakin. I prefer the later as I feel her need to not train others and avoid calling herself a jedi should come back to bite her. She's clearly running away from her problems, and I think it'd be intersting if in trying to avoid creating another Vader her actions instead guaranteed history repeating.

I think some Inquisitors are in the galaxy acting as Thrawn's emissaries and by the end of Season 1 Ezra will show up as the Grand Inquisitor after being ordered to deal with her and Season 2 of Ashoka will be about saving and redeeming Ezra. Likely Ezra will mirror Vader and cause Ashoka even more emotional stress for her to overcome.