"how is he going to wrap up gaster and friend in these last two chapters!"
TOBY FOX TOLD THE STORY OF UNDERTALE IN UNDER 8 HOURS IN SPAGHETTI CODE!!!! WITH A DREAM!!!!
(Theory)
//What if the Knight, at some point of the adventure, realized it wasn't hollow at all, and that becoming the new receptacle would fail just as THK sacrifice did, so instead of containing Radiance they decided to kill her instead to solve the problem at its root?