Forum:Precursors?

Because my Exile Universe is based around the concept of surviving Precursors waging war against the UNSC, and the release of HALO: Cryptum, I have a few questions to ask:


 * How does it deal with the Precursor's 'Extinction?'


 * Is there still a chance for me to use Exiles in my Fanfiction?


 * What happened during the Forerunner-Precursor war?


 * How does the novel describe the Precursors ability to 'accelerate evolution?'

My article about the Exiles and my reason for their survival centers around an incident during the events leading up to, and during the Precursor's war with the Forerunners about the Precursor society breaking down into civil war due to conflicting beliefs about how the mantle should be managed. The Precursors fall into a civil war and the main Precursor faction, basically the followers of the traditional 'Mantle' outnumber and destroy the rebels.

In an attempt to silence any future 'non-believers' the Precursors eliminate the non-believers. In a despereate attempt to survive those not captured leave the Milky Way Galaxy via 'arks', vehicles designed for long-term journeys in slipspace.

Then, the Forerunners begin the war for the mantle, heavilly outnumbered and recovering from the civil war, the precursors are devastated one battle at a time until finally some Military leaders don't believe they could win the war and break off from the main force.

Precursor society is in turmoil, the main society is split in two, those believing they could win, and those who choose to join the rebels. The war continues, the main faction of precursors is systematically destroyed, they lose so many ships, so many colonies that they can't make any more and surrender.

The rebels attempt to flee the Forerunners, and after gathering enough followers they leave the galaxy as the first rebels did decades ago, in short, they are 'exiled' from the milky way galaxy.

- In a galaxy far, far away.

Basically, the reason for their return is that they encountered another advanced civilization, or the flood(?) and are forced to come back to the Milky way, to seek refuge and help from other Precursors. Their technology is lost because they no longer have the capacity to create their advanced tech due to the conflict in another galaxy. Their religion, and government also degrades, their belief in protecting all life, and keeping a planet's natural habitat intact became a hypocritical belief, once again because they aren't able to produce energy 'cleanly' anymore.

Once they return in 2618 CE they encounter the UNSC on the outer rim of Sangheili controlled space. They meet, and attempt to communicate. The matter is left to ONI, and in 2620, the alliance between them breaks down, due to humanity, and the Elites' destruction of planets and their ecosystems, hunting, genocide, etc.

How plausible is this theory of the precursors returning to the Milky Way?