First of all, I wonder how many of Galaxy's people actually were in on the scheme - nearly all of the defensive forces of the Battle Galaxy were AI drones (Ghosts), and the only manned squadron we see were cyborgs that Grace apparently could control at will. Did she and her accomplices deliberately sacrifice their entire colony fleet as a diversion to their scheme, or did they destroy it because they wouldn't submit? Or, is it still out there, somewhere, waiting to cause trouble?
It's an interesting statement made during the fight - The Protoculture knew of the Vajra, both admired and feared them, and drew inspiration from them for their works. This finally explains the non-humanoid Protodevlin, their ability real-time communicate / control host bodies while their real body was imprisoned (Gigile, Gepernich), ability to withstand certain massive attack forms, etc. It also explains the same things for the Protoculture bio-mecha we see in Zero - and it was probably experiencing THAT mecha, that led Mao (Cheryl's grandmother and one of the major characters of M-Zero), to go looking into the Protoculture's past, and discovering the existance of the Vajra.
Does Ranka's means of curing of Cheryl mean that Cheryl is now, too, a "queen" of the Vajra? They are now both effectively interfaces with the Vajra collective - and it is interesting to find out that Ranka's song was an ancient Vajra relic, from long before the Protoculture, that was used as a homing signal, to allow separate "hive-minds" of Vajra to locate each other for reproduction - by the time they encountered the Protoculture, the Vajra had already re-assimilated into one giant hive mind. It's quite possible to surmise that, when the Protodevlin brought down the Protoculture, they probably nearly also wiped out the Vajra, because of that weakness of having only one queen left.
And, what of the love triangle? As I pointed out in a Veoh comment, we ARE talking about a 2059 recreation of California, and especially the San Francisco area. The colony has taken a serious hit to the male population from having to fight the Vajra and the Galaxy traitors. Are the rules concerning relationships even remotely as restrictive as pre-Zentraedi Western civilization? Given the origin of Frontier Colony's concept, do we even know if the standard forms of relationship, especially when you bring in 50 years of living with Zentraedi, are law, or just custom?
In other words, to paraphrase Ben Rumson,
"Show me in the Macross Universe it says that Aldo can't have two wives..."





