It's definitely cool, but I'm glad they used their own soundtrack, going too far and using too much of other series music would actually feel like the nostalgia-baiting that people accuse it of.
"The Zeta fanservice episode could have used more of the soundtrack" is a very true statement that's emboldened by how flawlessly this piece matches to the battle scene, but also the simple truth is that most Gundam can be improved by putting the Zeta soundtrack over it
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Absurd control over that MA, dude really is THE Newtype.