I honestly completely forgot about Vyre killing Jezrien. I was just thinking about what might happen with the Odium-aligned characters (Vyre, Nale, Venli, Taravangian,...) in the next books, and how their stories are going to turn out. I was considering some of them as Yelig-nar's new host, and when I got to Nale, that just seemed to be the obvious conclusion.
But if the nine Heralds that are left are enough to seal the Odiumspren in Braize - then why were there ten heralds to begin with? I can't imagine that Tanavast would say "I technically only need two or three people of you people to suffer in Hell forever, but since I've got this whole decimal motif going on..." Jezrien's death must have had some effect, right?
Also, I really want to know whether the Herald-Yelig-nar-fusion would work (Nale just seems the most obvious candidate due to his siding with Odium). It's not really something that I want to actually happen story-wise but I'd like to know what would happen. Would Nale's highspren co-exist with the Unmade? Would it prevent Nale from becoming a Yelig-nar-host? Or would it just be ripped away? Would his surgebinding abilities be replaced by Odium's surges? Would his body actually change like Amaram's (seeing how its not the body he was originally born with, I don't know how connected it is to his "soul" or identity). Or maybe he's just not passionate enough to be a good host? Also, IIRC, Amaram swallowed a smokestone (associqted with Nale and the Skybreakers) and was covered in Amethysts (associated with Kalak?). Do you think that has any meaning? If he summons his Radiant-Armor, while being corrupted by Yelig-nar, would the Radiantplate break like Amaram's? Would his highspren also be changed by Yelig-nar? And if so, would that have impact on their bond and oaths? If Yelig-nars intention diverged from Nale's oaths, would he lose his Radiant status? What resonances would all of that result in? If Nale ate the stone, but can't become Yelig-nar's host for some reason, could his highspren inhabit the stone instead (and if yes, how would digestion affect his spren - maybe I don't want this question answered). Would Nale be able to switch on his Radiant/Herald and Yelig-nar forms like Venli can switch her Voidbringer-Eyes off? Would he use voidlight or stormlight?
What do you think would happen?