Here's the problem, Revelations take place in the Aether or the Infinity or the reality beyond.

The place where the Elders can't see because if they try to look, the result would be corrupted Keepers aiding the Apothicons.

Not to mention time and space doesn't matters in the Aether.

Whoever in the Aether can exist at any time in every dimension.

Gersh is enough proof.

If we defeated the Apothicons who always existed in the Aether, how is it possible they could strike again ?

If the cycle reverts to the past, well that's "time" and it doesn't matters to the Aether.

Whoever exists in the Aether, can exist at any dimension at any time.

Richtofen explain it via the Shadows of Evil scrap.

115 is the fabric of time and space, the thing that holds everything in the universe.

The welding of the universe and the thread that holds it all together.

If the Apothicons have such powers to manipulate time and space, then you have to fight them in the place where time and space doesn't matters !

Which is why Richtofen says "The war is in the infinity" in the scrap.