Board Thread:General Discussion/@comment-27524978-20160210030742/@comment-24378656-20160217052605

This theory has a LOT of holes in it, I'll just copy and paste most of the points I made on a comment in the YT video (and yes it's quite long but I have a lot of time on my hands):

-Sans states that they made the costume a few months back for a costume party

-If the people on the picture are Ness and his friends, how could Frisk recognize him as Sans?

-The "strange symbols" on the blue prints are most likely Windings and thus written by Gaster.

-The whole "Trying to go back" thing during Genocide Run is most likely referring to time travel.

-"and getting back to the surface doesn't really appeal, either" That's not saying that he no longer considers the surface his home, the next line explains that "cause even if we do... we'll just end up right back here, without any memory of it, right?" This is of course referring to all of the resets the player makes.

-Bones are organic

-This is mostly speculation but I am 90% that the picture of the 3 smiling people that says "Don't forget" is of Alphys, Gaster, and Sans. People have speculated that it's Papyrus instead of Alphys but there is a special line of dialogue during the True Pacifist ending which implies that Sans and Alphys know each other. It's also implied (I know I say "implied" a lot here but you kinda have to when talking about Undertale lol) that Sans was a scientist once, and besides, it makes more sense than having Papyrus there, since we can assume that Alphys and Sans were Gaster's lab assistants or something like that.

-Sans isn't the only one who knows about the sun. Alphys says something among the lines "It's even better than on T.V!" regarding it.