Ok, let me detail a little bit more, with some lore from the Books, and a little speculation:
The Dark Wheel has almost surely access to some Thargoid technology, that we know, from the books.
I want to point what I think is a very important hint we didn't catch.
It's a thing that you notice if you are hunting for the UA.
The only convoy that makes me jump from my chair, every time I spot it, because I'm hoping it's the UA convoy, and because it's almost composed by the same ships,
is the Hafnium 178 Convoy.
All the other convoys are different: they usually have 3 T9, or random ships.
The only one convoy that is equal the the UA one, is the one carrying Hafnium. Usually 4 Anacondas or some mix of Anaconda, Vultures and Dropships.
So to me it seems that those two convoys, UA and Hafnium, are really linked in some way. They are transporting things for the same "entity".
I'm almost sure the Hafnium is needed.
Every player can spot and if he wants, take on an Hafnium convoy, to get the Hafnium.
The SAP 8, on the contrary, needs an Elite Rank, so I strongly think SAP8 is just an hint.
The Dark Wheel is building or trying to reproduce the UA, for whatever purpose, using Hafnium as a fuel, or similar.
For all of this, I would add to my
n.2 experiment, some Hafnium 178 in the hold of the "Pioneer" ship.
EDIT: Ok, the Hafnium was added later in the game. So it could be just an hint itself, like the SAP8. They are just ingredients of what the DW is trying to do... I wonder if the SAP8 convoy is the same as the Hafnium and the UA one.