Cold Glider told me to get in here and take a brain dump on my theries so here it goes.
I cant really think of all of them but they'll come back to me. so for starters ithink it has somthing to do with4 player co-op note that all hard acheivments are 4 player co-op with that said the mythic skull stands out beacause of the Mythic maps and what not so we should definitly start looking here. Next on translating the glyphs i belive the Y shape its self is the forerunner ship( keyship) to be exact, so that leads me to belive that the glyphs around the ship are the 3 different prophets seen in glyphs a, and b, now we find away to tell the prophets apart and try to find a story in the glyphs. and the last one i can think of right now is the adress of bungie is 343 so ive looked all over D03 and i have found somthin interesting to me atlest on 1 side of the street there are buildings 363 and 333 in between theese is where 343 should belong but instead theres a court yard door(unopenable). thats all for now sorry about the grammer i hope this is helpful in some kinda way.