I ponder where the cannon story of our adored Halo-verse is heading for hours … DAILY . And a few questions that tie everything together from the games to the novels always HAUNT me .
These questions are as follows - Why haven’t the forerunners ( as we know at least the diadact survived the firing of the Halo array ) returned sooner to help us ’ reclaimers ’ ??
- Why was the Chief and Cortana seemingly taken to Requiem and by whom ??
- What is the Flood / Precursor link and where are they now ??
- What is this ancient evil and why has it ’ awoken ’ now ??
We know that the Forerunners seriously underestimated the severity of the threat that Flood posed and reacted far too late . Paying the price with what we thought was total sacrificial suicide .
It went against their own ’ religion ’ the mantle to even fire the Halo array and cleanse the galaxy of all sentient life .
I feel this deep rooted eternal shame is what lead the didact to enter Crytum on Requiem itself … This and his supposed death of his beloved wife the librarian .
The librarians plans ( and they were also so VERY rushed and not all she’d have wished to have made ) were put into fruition and life in the galaxy was reseeded again as we know . The Flood was stopped ?
The Forerunner civilisation wouldve endured almost near destruction . The precious few who did survive would have all probably have been patiently waiting for the librarians plans to unravel ( possibly all in Cryptums ) long waiting for the reclaimers to rise from the ashes and awaken them to the knowledge that their crimes against the mantle were now pardonable . The Forerunners were deeply Noble as Cortana said herself … And I also feel they were near religious .
Now … This ’ Ancient evil ’ … I think after the reclaimers find the few surviving Forerunners , this Ancient evil’ awakens 'because it is of Precursor / flood classification , being that the Precursors ARE the flood , by the extent that the flood is an ’ extension ’ of the precursors by means of a telepathically controlled bio-weapon , are now maniacally enraged that the Foreunners weren’t apparently annihilated and now can’t / or haven’t fully , tested the humans and are now hell bent to reset all and retake the galaxy ?
I also believe that Medicant Bias ( who now is a integrated super daemon in Cortana herself ) lead the Chief knowingly to this Scenario to stop his things going full circle again .
This is all highly speculative , subjective , and personal . So feel free to discect , digest , and destroy at will . But it does nearly answer all the questions that haunt me as to the who , what , when , why now and how !!!
I’ve had a full blown halo-gasm finally putting it all in words .
I wish to thank Toa Freak , Nihilus Shadow , Decepticon Cobra , Deva Path and Born2Die for the inspiration I’ve absorbed from their thoughts and ideas I’ve read .
Thank you , hope you’ve enjoyed the read 
Ps … Trolls will not be feed … They can keep themselfs under the bridge which we use to walk over troubled waters … And may only be casted stones as headshots as we do so .
Pps … In the next few months I realise I’m most probably going to shake my head and say " No Nick , you wasn’t even a quarter right " .
. I obsess to much with it all I confess .