My headcanon is that the earth-alien war is the point of divergence separating the resurrection timeline and the dark horse timeline
There is a hint in fire and stone that engineer tech is capable of time travel
What if the Mala'kak machinations led to the infestation of earth before he was eventually killed in the events of the comic known as "the alien"
His death and the destruction of his ship erasing all evidence of him being a time traveler
The RPG timeline and the dark horse timeline can be the same timeline to a point