As a writer and designer on the original Rogue Squadron, I helped to come up with the Imperial defector known as Kasan Moor. She was one of the Empire's best pilots, from the 128th TIE Interceptor Squadron. (Modelled after Baron Fel's 121st.)

Because we invented her for the game, she fell into the abyss of non-use that so many game characters find themselves in. (Picture the La Brea Tar Pits, only instead of being filled with sabertooth tigers and woolly mammoths, you've got little-known video game secondary characters and sidekicks. 'Tis a sad place. "Leebo! What are you doing here??!")

So what ever happened to her?

We know that she survived to the Battle of Calamari, but I don't believe she remained an active member of Rogue Squadron that entire time. Moor's head was filled with valuable Imperial intelligence, and the Alliance and New Republic needed that knowledge. It's my belief that Moor retired from Rogue Squadron before the Battle of Hoth, and became an advisor to Mon Mothma, General Madine and Admiral Ackbar.

Her appearance at the Battle of Mon Calamari was unofficial and done purely as a favor to Wedge Antilles, whom she respected and admired. Thus, no official sources record her participation.