Board Thread:General Discussion/@comment-26006155-20190617222636/@comment-32182236-20190726225931

I do think people have Gaster's memories now.. They're just scattered across.

He was "erased" from the timeline.. But it wasn't simply "Gaster never existed, alternate reality time".

His essence was scattered across time and space. And as a result, so were his memories. Gaster's Followers were affected by this, as they were connected to Gaster enough for them to get sent to an alternate plane of reality (I think they are in the place between the overworld and the void.. If such a place exists.)

Asgore might not have remembered Gaster.. But he certainly knows all of Gaster's inventions exist.. And Gaster's name is still on the records. Generally, everyone would be able to agree that Gaster existed.

...Which does mean that perhaps the memorial being for Gaster makes sense. Even if nobody remembers him, they'll know that there was a previous Royal Scientist that died at that time. And they'd make a fountain in his honor.

Perhaps there was no statue, however, as they didn't recall what he looked like. Which left a blank spot for Mettaton to take over a week before Frisk fell.