Also as a more serious post I keep seeing claims that Gquuuuuux is telling a story about Gundam or is doing “uc slop” or sudden rebuild bullshit in the last five eps but no it’s not. It’s telling a story about two possibly three teenagers proving that they have the right to decide their own destinies and not be bound by what the older generations have decided for them. It’s just that it’s achieving that by using the most iconic parts of Gundam to represent the older generations.
The UC “bullshit” is the culmination of the shows thesis about how the newer generations need to be left free to chart their own paths. Nyaan and Machu represent two ways in which younger people live with this. Nyaan aimlessly floats through life without convictions or passion for what she’s doing, her only wants restricted to her needs while she pines for what she truly wants but is unwilling to grab it until her hand is forced, and Machu is raging against the bonds holding her with no regards to what happens if she breaks free, she just knows she needs to be free becuase that’s worth whatever she’ll lose in the process. And then if I’m right about Shuji (and even if I’m not the earlier stuff with the red Gundam still fits) he’s the total loss of identity outside of the older generations wants and needs he no longer has his own id or ego he’s subsumed by the older generation and mirrors them (like those kids whose parents never made it in sports or whatever but they “totally could’ve” so the kids are forced to push themselves to the brink no matter what they actually want to enable their parents need to vicariously live through them.)
The fight against RX-78 isn’t just them fighting to prove their universe’s inherent right to exist but also the younger generations right to chart their own paths. This is why Challia and Kycilia’s treatment of Nyaan and Machu are so contrasting, Kycilia impose her own values and beliefs on Nyaan and Nyaan fights against them, she used the gun she was given to protect her self to protect someone else finally choosing what she wants rather than floating along. While Challia gave Machu the freedom to do what she felt was necessary and her gun was used to free herself and the Gquuuuuux to not only achieve what they wanted but to reach their full potential with the omega psycommu. It’s the same reason Challia doesn’t want to kill Xavier. he let Xavier go the way he wanted to and do what he felt was necessary and even though they’ve ended up on opposite sides he doesn’t want to take that freedom away from him in death. Whereas Kycilia was fully willing to kill Nyaan as soon as she didn’t align with her beliefs. And I think this is partly why Challia was chosen and written the way he is. He’s not an icon of Gundam like Char, Lalah, Kycilia, Amuro or even the titans. He’s of the og series but isn’t bound by it, it’s why he can straddle the line of being of the older generation but not trying to bind the newer generation to what they decide and be the only one willing to let them have the freedom they deserve.
The RX-78’s appearance is the manifestation and climax of this, the gquuuuuux timeline isn’t doing what it’s supposed to so it must be destroyed. This isn’t a show about Gundam, its not a meta story about Gundam needing to move past the UC timeline, it’s a show using the most iconic example of the old generation that Gundam will ever have to be the final boss in Nyaan and Machu’s journey to prove that they have a right to decide their own destinies. It’s why Beyond the Time works so well at the end of ep 11, it’s not only a callback but a call to arms for Nyaan and Machu to change their destiny and futures and share the happiness that’ll come from being finally, truly free.