1 whe have seen that there will be fights against kirby puppets, but since kirby is the only one who wasn't caught, the villain must know kirby REALLY well to fisically copy him.
2 in the guest star mode in kirby star allies, the morpho knight description says his appearance means that the apocalipse is near, plus, the stage when you fight him changed in every dlc, first showing hyper zone in the ground, then dark star core, giving hint about a zero return.
whe can easily see the word of light beginning as the apocalipse, sinse all the population of the entire galaxy was turned into spirits(which basically mean being DEAD).
3 the wings of the villain are white and red(like zero 2) and blue, which is a plausible change in his third incarnation, considering how munch he changed from eyeball to angel.
AND THESE ARE MY THOUGHTS ON THIS TEORY, HOPE YOU LIKE IT AND COMMENT WHAT YOU THINK ABOUT IT.