Board Thread:General Discussion/@comment-26006155-20181123023529/@comment-26006155-20181208120601

Here's why six souls -were- available on the night of Gaster's Darkest Experiment.

It's always hard to pin down the movements of time travelers, or alternate timelines, but the Darkest Experiment clue is in True Lab Entry 17.

Two versions of Entry 17 actually exist, both only accessible through the code ( https://gamefaqs.gamespot.com/pc/180989-undertale/faqs/72468 search for "entry", scroll)

One is in our main timeline, with Alphys talking about how the Fallen Down monsters are turning to mush and fusing together.

But the second one, Gaster's infamous Entry 17, talks about the Darkest Experiment.

While these timelines are clearly different, I don't think it's too much of a stretch to say that each entry occured at about the same time in both timelines. And Gaster's Entry 17 was recorded at a point where he, Sans, and Papyrus were still friends.

Something happened between this original timeline, where all 3 members of The Font Brigade were together, and Frisk's adventure in Undertale, where only Sans and Papyrus are there, and Gaster might have die before Chara even arrived, if the MTT memorial fountain was for him.

Gaster's memorial in the present timeline does help show he was doing determination research at a time before any of the six human souls were available.

But Gaster's Entry 17 shows that in the original timeline, he, Sans and Papyrus were all in the lab together at a point in time there the six human souls WERE available.

So in the original timeline, Option C, the genocide of most of monsterkind to get the power equivalent of a 7th human soul, would actually work.