Overlooked sans undertale is sans deltarune evidence

I realized this a while ago and am so so SO surprised I’ve never seen it mentioned in a theory video!

Sans is the only character to have the exact same theme in both Undertale and Deltarune! I was listening to the soundtracks one day and thought “huh funny that Toby Fox has the exact same song on his spotify twice” n then I was like waaaitt a minute.. sans is the only character that applies to! Another piece of obvious evidence that I feel gets overlooked due to its simplicity is that he’s also the only character brought over from undertale that has he exact same character sprite. I feel like this stuff doesn’t get mentioned bc oh that’s just sans for yah of course he wouldn’t look or sound any different he’s just such an iconic character, his theme and design being a big part of his identity. But it definitely seems notable that he’s the only character this stuff applies to when there’s so much additional evidence to prove there’s only one sans across both games. I’m personally totally convinced of this theory and would be very surprised if it ends up not being the case!!