Everyone is intitled to their own opinions. I like to believe however, That since the rear end of the frigate is only present when the vegetation has healed (a process that would take no less than a year), and not when the planet is smoldering, would lead me to believe that ship crashed long after the events of reach took place. I also believe that Forerunner symbols are not important in the actual game, The Pillar of Autumn has a marathon symbol branded on it, as does guilty spark. and as proven by the game REACH, The book titled "THE FALL OF REACH" had little to no cannon in the actual games.