I’ve just finished watching Two Left Thumbs’ video about Sans being a darkner and it’s incredibly interesting to me and this is a very half assed theory that could have plenty of holes, but I’m also tired at its 5 am so go easy on me... but could it be that sans is in fact a darkner and beyond that he’s the knight that locked up the three kings leaving the spade king in charge? Could the similar color pallets between sans, lancer and the spade king be intentional? After watching the video there seem to be some patterns that suggest he could be a darkner and I’m just wondering if that were true could it be that he’s the unseen knight thus far into chapter one?

TL;DR I watched two left thumbs’ video and I’m tired and I think sans is the knight talked about by darkners