It all appears to be interconnected somehow, The situation at Semiki appears to involve Rogue Drones, Drifters, Sleepers, and possibly Triglavians. Perhaps even agents as yet unknown.
I’m still not convinced that Triglavians actually live in the Abyss. There are no habitation structures we can see, the gates appear to be part of an organised network, and linked to the caches and nodes. The entire system could be, at least in part, automated; the extractor nodes and subnodes use some kind of bio-adaptive agent to mine minerals. When those are full they ferry it to the caches, which, in turn, notify a central point when full. Then a Triglavian ship comes out and picks the stuff up, returning it to their habitat area. Sure, they could live in the Abyss, but why bother, planets, stations in a system outside the weather effects zone. If they have some kind of affinity for the Minmatar lifestyle, even large city-sized ships outside the Abyssal area. Those ships could even function in New Eden, eternally cloaked, potentially. Some of the Triglavian ships encountered in the Abyss are damaged, possibly due to combat, but it could be due to the duration of their stay in the area; we simply do not know.
It looks, and feels, like, an industrial operation, farming resources for their civilisation. Everything we find has some form of utility, a purpose, transport, mining, defence. There is no social or political infrastructure there.
It’s the same for the other groups present. Rogue Drones in New Eden build things, dig holes in asteroids and create bases. It would make sense for the Drifters to move a Hive to some place nearby, they could use it as a base and easily defend it, outside the storm zone. Sleepers, well they are a different case, the ones in the Abyss are different and seem adapted for it. All these groups appear to be hanging around, near the gates, and the cache. Perhaps waiting for it to fill, or to intercept materials destined for it. Everything is about resource gathering, it may be that the Precursor races are able to utilise Isogen-10 in much the same way as Isogen-5.
So what are they doing with it? Rogue Drones are not Precursor, but they seem to have acquired some knowledge of that type of technology. How long before we see new, and vastly more powerful structures appearing in the Drone Regions? The Sleepers are probably trying to rebuild their installations in wormhole space, that would make sense. Drifters are seen all the time, scanning structures, salvaging from Jovian Observatories. Originally, massive fleets were encountered, presaging the incursions and later the Deathball attacks. What if that is their motive for expeditions into the Abyss, rebuilding? It is how groups on a war footing function, attack, rebuild, attack again. Given the current spike in activity I would not be surprised to see much more happening.