An: Normally I don't write like this, but I don't have enough time to actually write this right now. So the best I can give you is a storyboard, the actual story if and when I write it would likely be 15x what you see to cover each topic
Back on Remnant with America now being a place that is 'newly discovered' to the people of Remnant people want to know all about this new mysterious 5th kingdom. Where did they come from, what was their history, where were they during the great war? Were they attractive? Were they the remainders of a pre great war country that managed to avert the worst of the war?
Questions, questions, questions. With little to no information besides that they often flew in flying saucer shaped ships at speeds beyond even the most advanced air ships that were on everyone else's market. The only thing they new was that Atlas and Mystral big wigs had cut a deal with them. What could be gleamed from their trade was marked advancements in technology and medicine by the two kingdoms.
In another scene the Incredible Girl Pyrrha Nikos had secured another flawless victory and like always donated the majority of the money she received into orphanages and cartographic research. When ever she was questioned about her odd choice in donations she would only reply that kids will always be the worst out a grimm invasion, knowing where to find them and making sure that they have room and board is always the right thing to do.
The Lone Courier is searching for a means to prove to Salem that what she is doing isn't sustainable for either her or anyone else. Researching ancient tomes for evidence that an abundance of dark will make the light's retaliation that much worse.
In his search for methods he finds himself at Bunker academy in Vacuo as a guest instructor working with head master Haymitch, who he finds knows a lot more than what he lets on. He just has a bad habit of not understanding half of what he says. It's his semblance 'hair-brained' he knows a lot more than what he should almost encylopediac, but after he acted on the information given to him he forgets about what it was unless it pertains to any long term goals that he may have had.
Its with this in mind that the LC takes an interest in one Sun Wukong who the semblance had marked as the best person nearby who could find things that weren't meant to be found. The LC becomes an expeditionary instructor and teaches a basic version of how he himself would scan an area for shelter, evading hunting parties (Grimm in this case), transporting people and caravans through hostile areas. All the while keeping an eye on Sun and Arslan who seem to be opposed like oil and water. Where as Sun wants to try to put what he learned to the test Arslan is more interested in making sure that everyone stays with their instructor. They are both around 14 years old. While Sun has his cadre with him Arslan is mostly alone due to her being such a stickler for the rules and her not having found the sense of calm that she displays in canon yet, while still doing her best to be a team player.
The LC is still waiting for Sun to show him what made him special enough for a knowledge Semblance to make him stand out of a colorful crowd, However, matured as he is no longer one to place all his eggs in one basket. The LC has a plan in mind that should be able to defeat Salem should Sun either be unable to help him find what he is out there for. Though it is one he isn't too sure he wants to resort too as the as of yet unknown results may just make everything all the worse.
Still with him learning Grimm anatomy he is able to get a more accurate read of how much punishment they can take before it becomes too much for them. The Pipboy's ability to manipulate DNA is something that he finds to wonder if there is a hard limit on.
Back in the Capital Wasteland which had seen a massive restoration and build up in defense. Nate can be seen with the Coalition's brightest, spit balling ideas. Numerous topics come up from knowledge of the excluse Marine Corps semi power armor, to the use of the G.E.C.K. and a work bench. With the help of Mr. House who still wants to get his own piece of the pie and the Tech Savy duo of Sally and Nate they are able to repurpose and power many abandoned factories into various factories needed to build robots and infrastructure.
Mr. House shows why he managed to survive with his brilliance for the last two centuries as what would have taken the others possibly years is fast tracked to weeks of development. The Coalition at large is suspiscous of House, especially after having been told what his plan for Vegas was. But they all realize that no one could match his intellect (think Tank is not known about at large).
The Enclave remnants actually do have news worth reporting, as their surveillance indicated that the local Deathclaw population was hostile to the Grimm, unfortunately not much could be done with this information as the incubation time for them takes time. Though perhaps not completely unexpected the institute had taken to studying the wastelands' populous and with an invasive species like Deathclaws they had no choice but to study them extensively.
A discussion had started about the varients of the creatures that plagued the wasteland and it was agreed that the Commonwealth definitely had it the hardest when it came to Deathclaws. The ability for them to randomly gain full strength and increase in aggression was too great to overlook. But if they could weaponize it they could do more than just hold their ground they could eventually contain them if they could convince the Deathclaws to work with them.
Eventually it bought up by Mr. House that one of the 'Perks' installed in Pipboys could be of great help, if they could find someone with the perk they could reverse engineer it into a vaccine that would passify many wasteland creatures and nullify their aggression. Though this is shot down by the others' because while they have numerous means to develop this Vaccine it would take too much time and effort to actually get it working. Not too mention if this Vaccine would need a second dose.
They don't have the time even if they have what amounts to limitless resources. They are fighting a limitless enemy with a limited number of troops.