#dark matter

Researchers in the U.S. have carried out the most stringent tests to date of the idea that an ultraviolet glow in the atmospheres of giant planets could partly arise through the indirect interaction between dark matter and ordinary matter. Led by Carlos Blanco at Penn State University and Rebecca Leane at the SLAC National Accelerator Laboratory, the team's results place some of the tightest constraints yet on the strength of this interaction. Published in Physical Review Letters, the study also strengthens the possibility that the giant planets in our solar system could be used as natural dark matter detectors.

scientists are genuinely atrocious at naming things, like who let them cook.

it is mostly the physicists fault but like look:

The Higgs boson — alternate name GOD PARTICLE

W.I.M.P.s — alternate name DARK MATTER

So basically, all the Dark Matter in Zero's colony are (supposed to be) connected to Zero. They might have a few individual traits, but for the most part Zero can see and hear everything his Dark Matter can. Likewise, each sibling is able to see and hear everything that the rest of the colony can. Dark Matter that leave the colony can sever the connection between themself and Zero, but doing so is probably one of the most painful things a Dark Matter can do. Gooey and Blade are exceptions of course because they were never connected to the hivemind to begin with.

ANYWAY, after Zero dies in DL3 that severed all connection between him and all of the other Dark Matter in the colony. In other words, every Dark Matter gets the worst headache imaginable.

With 02, there's no hivemind. All Dark Matter are basically their own people at that point (though there's still plenty that are loyal to him).