TOBY FOX JUST HAPPENED TO BE DONE WITH DELTARUNE CHAPTER 1 WHEN SANS BECAME A MEME; TOBY FOX KNEW THAT THE SWITCH RELEASE WOULD MAKE SOMETHING IN UNDERTALE BECOME A MEME AND PLANNED THE RELEASE AROUND THAT; TOBY FOX FINISHED DELTARUNE ALONG TIME AGO AND JUST WAITED FOR UNDERTALE TO BECOME A MEME THEN RELEASED DELTAUNE TO EVERYONES SUPRISE; TOBY FOX STARTED MAKING SANS MEMES WITH ALT ACCOUNTS TO MAKE THE GAME RELEVANT AGAIN AND THEN RELEASE DELTA RUNE