Thrawn would not have saved the empire had he been around during the original trilogy
This is such a common line of thought I see, that his presence single handedly turns everything around (literally this is just the qui-gon lives thing but evil except the people who push this idea are thrawn stans who can never acknowledge that he is evil), usually because "tie defender is better ship therefore victory inevitable"
There are a few things wrong with this
Regarding the tie defender, aside from the fact that it was still in development a year before Yavin and that even when development was done it would take time to mass produce the craft and train pilots for it, a single weapon does not win a war, not even a "superior" one (see the tiger tanks of wwii), how you use it matters, sure thrawn could use the defenders effectively, but not every imperial commander could, and that's not even addressing how rotten to the core the empire is as a system, or how having small ships without hyperdrives is a deliberate choice by the empire to breed dependency and curb independence in pilots and that the defender flies in the face of this foundational mindset of the empire
Secondly is the nature of the fight against the empire itself
This is not a conventional war, this is a fantasy war (dressed in Sci fi), the way to win is via heroes defeating the evil overlord with friendship, trust, and a little magic
And that precisely why Thrawn lost in Rebels!
He only looked at things as a military conflict, a war of resources, strategies, and tactics, that is why he dismissed Ezra acting as a Jedi to be a losing choice, and why he was so blindsided by the end result
















