Board Thread:General Discussion/@comment-26006155-20181123023529/@comment-26006155-20181208184953

No. That really isn't how it works.

Alphys only became royal scientist after Gaster died. So the original timeline, Alpha, would have all three members of The Font Brigade together.

The Darkest Experiment never worked, because Sans stopped it the first time. Gaster never got another chance because whatever Sans and Papyrus changed when they went back, Gaster "died" long before Frisk arrived. So Frisk never had to deal with Gaster the human  himself, only his mischevious shade that was seeking vengance.

I haven't traced all the events yet, or why Frisk fell into the Underground to begin with, so there's still a lot of the story missing. And it's still possible that Gaster's influence caused Flowey be animated in other timelines, an echo of the Darkest Experiment. But no genocide of the monsters happened beforehand.