I thought this was already known since launch? Now it’s just more obvious what happened.
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A lot of it's been implied in concept art but there's no real confirmation of a parade actually taking place before now, plus the ties to the battle of the six fronts is new. It's still not a great explanation imo but better than none. They could at least have attempted to explain why our Guardian chose to keep the Parade armour on rather than grab their best armour and weapons from the vault before going out.