SparkySywer is right though about Lucas’ statements on his sequel trilogy being contradictory. I recall even a single quote by him being somewhat contradictory.
Don’t have the quote on hand, but he basically says that there would be “no stormtroopers” in his sequels, but during that same answer he talks about how the stormtroopers would be like the Muhadjideen fighters, who wouldn’t give up and find their own little corners of the galaxy to bide their time in.
You are whooshing us, aren’t you? 😃 The quotes are in the OP of this thread:
George Lucas: That’s why they kept missing. Then after the Rebels won, there were no more stormtroopers in my version of the third trilogy.
and then:
George Lucas: Episode VII, VIII, and IX would take ideas from what happened after the Iraq War. “Okay, you fought the war, you killed everybody, now what are you going to do?” Rebuilding afterwards is harder than starting a rebellion or fighting the war. When you win the war and you disband the opposing army, what do they do? The stormtroopers would be like Saddam Hussein’s Ba’athist fighters that joined ISIS and kept on fighting. The stormtroopers refuse to give up when the Republic win. They want to be stormtroopers forever, so they go to a far corner of the galaxy, start their own country and their own rebellion.
and then:
George Lucas: It starts out a few years after Return of the Jedi and we establish pretty quickly that there’s this underworld, there are these offshoot stormtroopers who started their own planets.
Or is it another different quote from Lucas you are looking for? It would not be surprising if there was more!