What happened to the "Greater Evil"?

Community Halo Universe
1

The original description for Silentium was as follows:

"In the last years of the Forerunner empire, chaos rules. The Flood — a horrifying shape-changing parasite — has arrived in force, aided by unexpected allies. Internal strife within the ecumene has desperately weakened Forerunner defenses.

Too little, too late, the legal rate of Juridicals is only now investigating possible crimes by the Master Builder and others. Evidence-gathering agents known collectively as Catalog have been dispatched to collect testimony from the Librarian and both Didacts: the Ur-Didact, treacherously abandoned in a Flood-infested system, and the Bornstellar Didact, who accompanies the Librarian as she preserves specimens against the dire possibility of Halo extermination.

Facing the imminent collapse of their civilization, the Librarian and the Ur-Didact reveal what they know about the relationship between the long-vanished Precursors and the Flood.

The Precursors created many technological species, including humanity and the Forerunners. But the roots of the Flood may be found in an act of enormous barbarity, carried out beyond our galaxy ten million years before…

Because of that barbarism, a greater evil looms. Only the Ur-Didact and the Librarian – husband and wife pushed into desperate conflict – hold the keys to a solution.

Facing the consequences of a mythic tragedy, one of them must now commit the greatest atrocity of all time — to prevent an insane evil from dominating the entire universe."

However the updated version reads as:

In Halo: Cryptum, Greg Bear began a three-book arc set in the era of the Forerunners, the ancient and enigmatic creators and builders of the Halos, which continued in Halo: Primordium. Now, in the last years of the Forerunner empire, chaos rules. The Flood—a horrifying shape-changing parasite—has arrived in force, aided by unexpected allies. Internal strife within the ecumene has desperately weakened Forerunner defenses.

Only the Ur-Didact and the Librarian—a husband and wife pushed into desperate conflict—hold the keys to salvation. Facing the consequences of a mythic tragedy, one of them must now commit the greatest atrocity of all time—to prevent an unmatched evil from dominating the entire universe.

So…anybody have any guess as to the implications of the change? Does it in fact mean anything? Am I reading between lines that aren’t really there?
Or is 343 hiding a major plot point? Maybe they did away with that potential plot point all together?

Thoughts?

2

It also doesn’t say anything about the Bornsteller Didact. I noticed that and wondered if they had changed many plot lines and that is why the release date was changed as well.

3

I think the second one is just a TL;DR of the first.

4

If 343i changed that whole bit out someone should release the original copy. That part hooked my attention greatly.

5

Just because they removed parts from the description doesn’t mean they removed parts from the book. The old description did seem rather revealing.

6

I feel they just want people to read before knowing some of the more interesting bits of what may be in the novel, element of surprise.

A Unmatched Evil is more threatening and vague, than Greater Evil to me, it implies that this unmatched evil can not be defeated, perhaps only delayed.

I feel that could fit the Flood, but I would say since the Flood has already been added into the description that the unmatched evil/greater evil is something else entirely, perhaps The Thing from the Halo 3 terminals or a hint at the Precursors.

Before Halo 4 I would of thought the unmatched evil was the imprisoned Didact, or the true Ancient Evil, but now that I know it is not the Didact that is being called out as the unmatched evil, then it must be something we have never seen as of yet.