I was thinking how it would have been interesting to pull Xiao's death during the Chasm event, considering how he's the last of the Yaksha. I doubt they'll kill him off considering they had their chance, but who knows.
I can see both Childe (given all of his red flags), and Zhongli (being the most mysterious of the archons). Maybe Diluc and Kaeya would be on the same level of possibility, especially the latter, given his ancestry.
Maybe it's because we're actually planning his inevitable funeral