Historical And Cultural Differences Between Time Patrol Members II

We know almost nothing about later civilizations in the Time Patrol timeline which are there only as part of the background for Patrol missions into the past. We are told that an Era of Oneness precedes the Danellians and that the internal Patrol investigator, Guion, coming from a later and higher civilization, might know enough about the Danellians to be terrified. 

An optimal civilization would have difference without division and unity without uniformity but "Oneness" is ambiguous. At worst, it could mean enforced uniformity. A further novel could have been written upending everything that we thought we knew about this fictional universe. After all, do the Danellians employ Nazis to ensure that the Holocaust occurs on schedule? The Patrol agents that we see do not (seem to) know anything about that but what else is going on?

Two posts so far this morning and maybe an interlude.