User blog comment:AquilaeAltair/Ons Theories. First Theory (S3) - The black matter, something that adquired a physical form/@comment-36009152-20190606235427/@comment-38762161-20190616014512

Pretty much; everything has become insane.

I somehow believe Shikama Doji was expecting who could survive with Ashera's demon form without losing its life. I mean, it's true Sika Madu managed to possess each head without much effort until Shinoa came but; there could be a possibility that Ashera, being an untamed demon without memories, could have left no survivors to the point Sika Madu recreated the experiment until someone managed to withstand the power of Ashera as a demon.

The most curious thing is the fact that all cursed gears or more likely, black demon series with exception of Byakkomaru, Raimeki and Mahiru-no-Yo, belong to people with the seraph trait; which could mean that perhaps, by a small chance, those belonging to the users with the seraph trait share the Michaela trait.

Now, moving to the points on which you explain the crazyness between the procedure, yes it is more likely that she managed to survive, since it's something that hasn't been pointed out. Also, it could explain as to why Tenri shut her down on her own at the very beginning and also why Kureto didn't try to interact with her with the sole exception of taunting Mahiru and Guren.

Shinya, to a certain point, might have or might have not known about the experiment Mahiru and Shinoa went through; also, to give more strenght, there's a picture in the manga of the Catastrophe on which Mahiru wrote down about the issues of demon possessed children. Those results ended up with dead but on one of the panels we could see kids that were born in a crude way, I mean they ended up dead but with broken limbs or so on...perhaps, that's why the black matter is an important issue to Sika Madu and mainly Shinoa.

Who knows, this is becoming crazier haha