Spoilers regarding ending
Considering what we now know Hedrons to be capable of in terms of their powers and the patterning - is it possible that the OG Polaris patterned Jesse Dylan Faden into the siblings?
Maybe this makes no sense I was just wondering about it. Perhaps since the original child was a powerful parutiliarian it didn't work like it normally does? Also since CR states it was old and dying.
CR also states to not think of Polaris with any human emotion in terms of it's actions (which I agree with mostly) but considering Jesse says that it helped with closing the slide projector when they were being attacked by the not mother stuff I kind of assume more agency than just destroy hiss.