Ok, so...

Spamton's dialogue in his shop when you select TALK → FRIENDS:

ME? ... FRIENDS? EAHAEHAEHAEHAEH!!! KRIS! YOU AND ME. ARE ALREADY [Friend Request Accepted] WE DON'T NEED ANYONE ELSE!!! WE DON'T NEED [[Easels]] or [[CRTs]]! WE DON'T NEED ANY [[Man, Woman, or Child]] [[At Half Price]]!! WE DON'T NEED [[MIKE]]!!! ... ... Mike... KRIS!!! DON'T BELIEVE [[Anything You See On TV!]] THE MAN'S A CRIMINAL, I TELL YOU!! A CRIMINAL!!

And we know that chapter 3 will probably take place in TV world, or something like that.

So.

I think that it was not Gaster/Knight who talked to Jevil and Spamton.

I think that it all started from the end.

Their interaction according to my theory:

		
			Ch. - chapter, sb - secret boss

Gaster/Knight → Ch. 7 sb → Ch. 6 sb → Ch. 5 sb → Ch. 4 sb →
Ch. 3 sb → Spamton → Jevil
		
	

I know, this theory is fully based on Spamton mentioning TV, so it's a bullshit.

But still...