The information you bring back to PMR must be codeable within the metaphoric and symbolic language context available to your PMR brain. That is a big limitation and care must be taken that the information does not get warped during that translation (as the general literature demonstrates, that's something that happens more often than not).
Ergo, dream metaphors? Robert Bruce wrote about this difficulty too, in relation to OBEs. I've often wondered just how much of our dreams are from NPMR, because of the very thing you point out. It would seem that if dreams are related entirely to PMR issues, they'd be more literal, else, why work almost entirely in metaphors?
Developing NPMR science is another bootstrapping process that takes diligence, good methodology, and perseverance. You can't just go read it out of a book in some NPMR library -- it doesn't work that way. You have to learn through experience. And what you learn must be relatable to your experience.
This also is very interesting, as it has appeared, to me at least, that NPMR is just like PMR in the sense that those participating within that context are no more aware of the greater reality than those residing in PMR context, but just one set removed from a more confining set of restraints.
It doesn't take a lot of reading in Eastern philosophy to realise that a lot of what's in MBTOE was figured out by those fellow travelers, as well. What perspective should inform us about the context for your work? Is this reflected, in some part, in what your visitors saw in 'This Kid is Weird Enough'? Did they get a data dump of your MBTOE and the greater reality, or its effects upon some future and consequential changes in Earth PMR?
After reading about Seth at Wikipedia, I am struck by the similarities to MBTOE. However, a building respect took a dive when I read about Seth's ideas on Jesus. It's a matter on which I've done a lot of research. The Gnostics conceived the Passion of Christ to have occured in a Heavenly realm (IOW, not on Earth). HOWEVER, all, and that means the entirety of the Passion, the entirety of the Christ story, the death, the cross, the resurection and everything therein, is derived from the solar mythologies, and its evolution over thousands of years. So, if Seth got so much else correct, then how did Seth botch the Jesus thing so badly, just like so many others do? And neither is there a shread of evidence for John the Baptist and the Apostles. Paul, himself, is nothing like the Romanised version, and is even purported to be a Gnostic writer, who's supposed evangelical travels are another rendition of Orpheus' teaching journeys.
Assuming that there is an actual Seth, it is utterly fascinating how the Christian mythology has such a lock on Earth PMR and even NPMR former Earth residents. All of the other suns of god must be enormously jealous of his fame.