A Knight Of Ghosts And Shadows is a pivotal novel for two main characters in Poul Anderson's History of Technic Civilization. Flandry of Terra loses his son and his fiancee. Aycharaych of Chereion loses his planet and his heritage. Flandry carries on. We do not know what happens to Aycharaych. Two volumes later there is a hint that he might have survived but that is all.
Was Aycharaych killed in the bombardment of Chereion? He could have escaped but might not have wanted to. If he did escape, he would have had no reason to continue working either for Merseia or against Terra. Might he instead have worked against Merseia? Could that be why, when the Empire falls, its space is not filled by an expanded Rhoidunate?
How could the Ancients/Chereionites have become extinct? If they are not, then where are they and could Aycharaych have joined them (although his anguish in the face of Flandry's questions does strongly suggest that he is indeed the last Chereionite)? (1) Another science fiction writer might have planned and presented a multi-volume series raising, then answering, these questions. Instead, Anderson wrote a long sequence of stories and novels about various characters living and working in many different well conceived planetary environments.
Longer term questions about history and the Ancients form the background for these works but do not become the prime subject matter. Thus, we get an approximation to real history. What is the later course of the career of Flandry's daughter? What will Fr Axor discover when he continues to examine Ancient ruins? Since the League and the Empire fell, will the Commonalty fall also? Such questions could have been answered if Anderson had just written this one series and had not devoted such attention to details in individual works but had instead concentrated on an Asimovian perspective of big galactic events. However, I think we should be very grateful that Anderson followed the course that he did.
(1) Anderson, Poul, A Knight Of Ghosts And Shadows, London, 1978, p. 215.