Unlike Ghost, who retreats to the void in ball form, The Hollow Knight's shade seemingly gets obliterated by the burst of light emited by the Radiance upon receiving the final hit
(Ghost is a descending ball in the last two images)
(Notice also how THK alone is blurry)
The Hollow Knight not being on Sister of the Void can easily be explained away by "camera angle" and "TC wanted it vague"
But honestly? I think THK's shade doesn't even survive Dream No More in the first place
This aligns with the regular endings having it explode entirely, leaving no shade or even shell behind
Utterly fucking evaporated
