Ninja Warriors Once Again and Dark Judgement Sprites?

[NOT_NOT_BM]

i mean on page2 texture resources is png.the R/G/B layer is all greyscale.but how about the Alpha layer? if this just a pixel art Texture2D does not need Alpha layer they ues.
Some Unity will use R/G/B/A layer to save different effects on a dds.
What I'm trying to say is that it's possible that something is in the Alpha layer but since they are converted to png combined with Alpha layer lost