Denial, Anger, Bargaining, Depression, Acceptance: the Five Stages of Grief. Macross Delta wsn’t going to cheapen Messer’s apparent death by bringing him back, so no one is really in denial.
Hayate, Freyja and Mirage are angry that they didn’t do everything they thought they could to prevent his death. Others still have more or less moved to acceptance, or at least the veneer of it, in the case of Kaname and Arad; keeping busy so the veneer doesn’t crack.
Heck, even Lord Keith is angry about to loss of his wind-dancing rival, putting a blade to Bogue’s throat when he mocks the dead. It’s an interesting moment for Keith, who shares a moment on the balcony with Roid, reminding him of their promise to make their world strong again.
Clearly Keith is pretty miffed Messer had to die for that end, but will get over it, while Roid worries for Heinz because no one else (including Heinz) will. Hayate has to storm off when Arad brings up the necessary matter of re-filling Messer’s cockpit, while Freyja keeps getting up and running no matter how many times she faceplants in the mud.
As everyone processes, the tech boffins sort out why Windermere is annexing planets with ruins: annexing them all (and they only have two to go) will allow them to exert mind control on all 8 billion inhabitants of the Globular Cluster (AKA Starwind Sector), bending everyone to their will.
To show he means business, the ailing king gets out of bed (possibly inspired by Hundred’s Karen) and leads the attack himself, overseeing the launch of the positively gargantuan, Final Fantasy-esque baroque flagship called the Sigur Valens, which was being hidden under a retractable mountain range.
It seems to me, if you have this much power, you’re probably set. But this is also about revenge. Revenge for that mysterious scar in Windermere; and perhaps also due to a powerful collective envy at the other races of the sector for their longevity. Windermere is committed to burning brightest, even if briefly.
A fire burns on the beach, with the whole gang assembled, when Hayate arrives. They have a kind of wake for Messer there, during which they eat, drink, sing, and be merry. A model plane is constructed as a symbol of Messer, which in a Ragnian ceremony will be committed to the sea to become one of the endless jellyfish beneath the waves.
The music during this scene is top notch – soulful, moving; especially when Mikumo finally shows up and starts singing, and the rest of Walkure joins in. They also read from Messer’s log, which is full of detailed critiques of his kohais.
Even though we didn’t see all that much of Messer, the outpouring of emotion here makes it clear that he was loved and appreciated, and will be hard to replace. That being said, I’m not sure Hayate is being very sensible when he assures Arad no replacement pilot is necessary.
The beach wake also kinda contradicts Arad’s comment about their being no time to mourn, as they had an entire evening to do so. However, that’s all they get, because not long after the sun rises on Ragna, the huge Windermere fleet arrives at Al Shahal—and they’re not their for R&R.