So who do you think the "Mystery" admiral was at the end of Aftermath?
I sincerely hope it's not Thrawn. I love Thrawn and all, and would love to see his triumphant return to the EU.... however I do NOT want Chuck Wendig writing him. His dialouge already doesn't seem like Thrawn.
Why it might be thrawn - The shroud of mystery behind the guy. He is obviously a man of significant power and influence. He's also a fan favorite. This would be a good time (chronologically) to introduce him. He would make a good arch villain for this Trilogy.
Why it probably isn't Thrawn - He is too cruel. Killing people as a "test", and if you didn't die then you passed the test? Thrawn wasn't so bloodthirsty with his own people. He valued life a touch more than that and I don't think he'd do something like that. Also, I think the Author wants you to THINK it's thrawn so you buy the 2nd book. I will NOT buy the 2nd book unless it's by a different author regardless.
Also - it sounds like Boba Fett is alive and well - but has discarded his old armor - so that's interesting. Wonder if he's got his old ship?