I think so, as many of the FUN value stats have something to do with Gaster, whether that being the Wrong Number Song, where the person asks to talk to some named "G-", there's the Goner NPCS, there's Clamgirl, who becomes Goner Clamgirl, and among all of them is the Mystery Man sprite, there's a lot of connections there, and it just makes sense with everything Toby has set up with the FUN Value stuff