i have mentioned this before but for consideration;
If the barnacles are engineered from real earth barnacles then they have 3 stages;
Barnacles have two distinct larval stages, the nauplius and the cyprid, before developing into a mature adult.
Nauplius larva of a barnacle with fronto-lateral horns
A fertilised egg hatches into a nauplius: a one-eyed larva comprising a head and a telson, without a thorax or abdomen. This undergoes six months of growth, passing through five instars, before transforming into the cyprid stage. Nauplii are typically initially brooded by the parent, and released after the first moult as larvae that swim freely using setae.
Cyprid
The cyprid larva is the last larval stage before adulthood. It is not a feeding stage; its role is to find a suitable place to settle, since the adults are sessile. The cyprid stage lasts from days to weeks. It explores potential surfaces with modified antennules; once it has found a potentially suitable spot, it attaches head-first using its antennules, and a secreted glycoproteinous substance. Larvae assess surfaces based upon their surface texture, chemistry, relative wettability, colour, and the presence/absence and composition of a surface biofilm; swarming species are also more likely to attach near other barnacles. As the larva exhausts its finite energy reserves, it becomes less selective in the sites it selects. It cements itself permanently to the substrate with another proteinacous compound, and then undergoes metamorphosis into a juvenile barnacle.
So we have seen these guy appear out of order; The Barnacle the last stage, feeding and excreting meta alloys and other mined materials, UA is first stage looking for the right area (nebulae?), UP is the second stage looking for the best spot to land.
Which MAY mean we need to look away from Merope, as Merope is the destination, not the origin?
https://en.wikipedia.org/wiki/Barnacle