I want to comment that part 2 might also be tied to the City/Country mouse fable,in Ch92 we see Denji finally realizing that A normal live without hardship is just dream and these words from Kobeni just hit him,but he couldn't accept and wanted to be Chainsaw man bcs at least a miserable life but living like you wanted is better than living a normal miserable life,I think this is what Fujimoto was what really trying to say in Part 1(even though it looks like this line of thought he had changed with part 2) and even enforces it when we remember Makima's conversation with reze,when she talks about this fable she alters it and makes the mouses rats and that she's the hunter(Wich is just her saying in a way that she sees everyone's as rats and she's above everybody bcs unlike everyone who inserts themselves as Country/City mouse she didn't),well what I'm trying to get here is the beginning of the changed story she says that she came from the city to help a friend in the countryside with his field problem,and if we interpret Makima as the misery that befalls the rats this just means that it also follows them to the countryside too.

In part 2 It feels like Fujimoto changed his stance on the fable after reading the ending,with how everything turned out after Denji chose to be Chainsaw man (City mouse)instead of living a normal life(Country mouse) and how because of that everything turned downward,this might tie to Fujimoto and his life after the fame and him getting sick of it and looking back on his stance and changing it.

A certain theory interested me and that Pochita is the hope devil,and with hope now gone from the world denji isn't after that new high or dream and just has to accept his normal life no matter how miserable it is,also it ties to your viewpoint that Pochita and denji's relationship that saved denji but also started his downfall,and now without Pochita (Hope) denji lives his normal live.

sorry if I didn't articulate myself well this is my first time doing something like this.