I agree with your statement. But you have to remember one thing, this is a WHOLE NEW TRILOGY so 343 have to write the story the way they see it, of course they have to take the lore into consideration when writing their new story. For me what ruined the game wasnt the fact we killed a forerunner or that, it was the death of cortana that ruined this game for me, The bond between mastercheif n cortana was EPIC, when playing as masterchief i truly felt a connection to the characters as the bond felt original now that is gone, well i dont know something might happen in halo 5 but halo 4 was good until the last mission