Major spoiler alert!
Id is easy. Interestingly, even though you don't have Omnigears anymore, their upgrades carry over to the original Gears. It makes sense from a programming standpoint to do it that way I suppose, but it basically amounts to Brigandier being magically upgraded once you get Andvari, etc.
Well, the fight would probably still be possible if the old Gears weren't magically upgraded, it would just take a somewhat different strategy.
Xenogears doesn't need any help against True Weltall, but that GNRS50 is still there to make things even faster.
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