Black pill:
Dess didn't even exist in 2017 when the alarm clock dialogue first released, she was literally a last minute addition to tie up plot holes and justify character motivations. There's an aggressive certainty that regardless of how important she ends up, she's not going to be "main cast" but rather something more nebulous that can be comfortably inserted into a mostly finished story. Major antagonistic roles are absolutely going to be tied to the ones toby already had and teased in undertale back in 2015, like w.d. gaster and friend.

Ralsei doesn't have glasses in this.
But the head telling them to study does.