The reason I pose this question is simply:
"…the story of Halo Wars 2 explores a vital and exciting corner of the Halo universe directly after the events of Halo 5: Guardians"
I wouldn’t think twice about it if I had never played halo 5 campaign. When you play it you get the feeling your missing a lot. It’s because you are! There’s so much external cannon books that contain the required build up to remotely connect with the characters played in the game. Don’t forget Nightfall, hunt the truth, etc etc. I for one wouldn’t be surprised if we have a Cortana appearance or an AI faction of some sort. Why else place this game on the current timeline?
Thoughts?