He was surprised by the lack of reaction? Bro... that scene was so over the top and out of left field it was simply too much to do anything with... like, all context was missing, so what was there to worry about? We reacted to how fucked up it was, sure, but caring about it being Maya? No, how could we? we have next to no clue what happened and it's such a severe jump there's no way it wasn't going to just be reset... also what you said about her being a lesser version of Maya he's done a shit job of getting us to care about, but still, as a writer, i can't fathom wtf surprises him about the lack of reaction... he didn't write anything to react to... any head in the box would've garnered the same response cause there's no person in the box, just a head... a dead, soulless head...
And we all know she won't die for real.
When Maya Prime disappeared, it was a loss (and it still is), because she... well, she's not there anymore!
If Sel was ballsy, he would have made Nu Maya disappear for good until the end of chapter 4 (maybe making a return, a collapse, of whatever, of Maya Prime, or a evolve Nu Maya, at the beginning of chapter 5), but no...
So, of course no one cares. It was just an event, not a turning point.
And whose fault is it? His. He badly introduced her (and she didn't evolve), and the moment he tries to put her on use, he decapitated her.
Good job, buddy. Good job.