Does it make sense that two dozen of jump capable ships were left collecting dust in the outer space of Darrian system when they were desespeate for shipping to maintain contact with their colonies?
IMHO, it makes no sense at all.
I also can't see any good reason for sharing out their few remaining starships (three each?) among the colony worlds, worlds that don't have the infrastructure to operate, maintain, or repair them for any appreciable period of time.(1)
This isn't any good but it's the only thing I can come up with currently which might explain that dispersal: In the immediate and short term aftermath of the Maghiz, the Darrians were fearful that Tanis(?) might flare again and so dispersed as many assets as they could. Once that "flare scare" wore off, perhaps because they'd sussed out the first explanation presented in AM:8, time, manpower, and resources were too tight to recover all but the most needed of the dispersed assets. Warships weren't needed as much as freighters, so they were left in the outer system and eventually forgot.
Like I said, pretty lame.
FWIW, I quite like your SDB suggestion and might very well add it to MTU.
However, as you note:
And, as odd as it might seem at first glance to most of us, too tied to previous assumptions and thinking, doesn't this keep with those requirements?
What sort of explanation can be created that will work well enough for the greatest number of people? What's the OTU explanation in other words?
1 - While I had no explanation for why those starships were parceled out among all the colony worlds, it didn't stop me from concocting a bit of incidental "treasure" for a series of adventures set on MTU's version of Winston.
The players were exploring the Eski Toprak region looking for a lost grav scow. That region had been Winston's main population center with settlement dating from the pre-Maghiz era up through the First Invasion when it was pummeled from orbit by Sword World forces, so it holds many ruins. The players eventually found the missing scow and the people who were responsible for it going missing too.
Among the rubbish and artifacts those people have been digging out of various ruins was a flat plaque about the size of an iPad with walnut-sized sphere embedded at the bottom. The sphere could rotated in any direction and it displayed a simple globe of Darrian. Whatever region of the globe faced upward, that region was displayed on the plaque. Users could expand or contract the plaque's display zooming about as far as what you can now see on Google Maps; houses, cars, etc. (iPads and Google Maps didn't yet exist in the early 90s when I made this up.)
The view wasn't "live", but the images had been captured over two centuries after the Maghiz. Someone had orbited Darrian and gathered all the images long after the worlds in the Darrians had lost interstellar flight. The images had then been programmed into the plaque and the plaque had somehow found it's way to Winston.
The artifact is priceless, of course, and there are no real answers to be had concerning it's provenance. It's just a nice little mysterious wonder like the Phaistos Disc.