Ahsoka's first season brought Grand Admiral Thrawn into live-action and revealed what happened to him after Star Wars Rebels, but season 2 still needs to explore one mystery of his time in exile. While there wasn't time for Ahsoka to explain everything that happened during Thrawn's nine years in the other galaxy, the show quickly and efficiently summarized most of what the audience needed to know. The season finale perfectly set up Thrawn's war against the New Republic in Dave Filoni's The Mandalorian Star Wars movie and left plenty to explore in a potential Ahsoka season 2.
https://screenrant.com/ahsoka-season-2-grand-admiral-thrawn-mystery/