If the Spirit of Fire went MIA in 2534, as mentioned in the Halo Wars timeline, then how could Red Team be summoned back to Reach in 2552? And why they didn't inform UNSC about the Shield World and the Flood? Perhaps are the 3 Spartan from Red Team those "too far to be called" mentioned in the Fall of Reach instead of Gray Team or is there any other explanation? What do you think?