after think a while i get a freaking random theory about the end
first gona look to the clues i get:
- have 7 kings with the colors are: red, blue, green, silver, gold, white and black
- shiro fake name means "white"
- anime tittle on screen is 2 k's 1 k written in black with white background and another written in white with a black background
- colorless king have a sort of body swap or possession power(for me is possession than body swap)
- us already know 4 of the 7 kings: red(mikoto), blue(munakata), silver(weissman), gold(old man), the green and white still unknow but the black(colorless) looks like being the villian
- weissman power is "unchanging" who work for givin him some sort of immortalilty(never ages)
- a new damocles sword appear who have all the others colors stones attached who gona belongs to the "white king"
now to mine theory