#darkenednarrative

Flowey wasn't redesigned, at least not overall. The extra embellishments to his design, i.e. the cloak and the crown, are specifically for the fight against him in Waterfall, just so he carries a little more intimidation factor there; wherever else he appears, he should be thought of as still having his initial design of a humble, unassuming golden flower with seven petals.

Ok, so.

Monsters don’t leave corpses behind. Therefore, there’s no cultural “death has to be confirmed with a body” thing.

Second, the underground is fairly small. There’s not a whole lot of places Papyrus could hide.

Third, there’s no reason for Papyrus to run off. Everything was just fine before he disappeared!

Asgore was already a well known scientist within monsterkind before they were sealed away along side Gaster. While his specialty is botany, he has more than enough experience in the medical field that people were comfortable bringing their ailing family to him sooner than in canon. With slightly more time on a group of dying patients, he discovered Determination and injected into them in a slightly different way than canon.

It's a safe assumption that Alphys injected the same amount into each group. However Asgore considered the will to live while administering the DT.

A group of mercenaries working on the edge of legality? Don't need too much more will to live, they are plenty willful as is.

A large group of the Royal Guard? Willful indeed but let's add a little more to even out any fluctuations.

A wife and mother with no battle experience? Oh, she needs a LOT of this.