Do slots set in events need to be in the stories?

I need to set a slot at the start of each conversation, so I’m using the tracker/events/ to set it. My question is, do I need to put the fact that a slot is set at the start of each story ? (Or a least one story with the slot set and one without it). Something like that :

    - slot{"entity" : "Rasa"}
* saluer
	- utter_saluer
* aurevoir
	- utter_aurevoir

The story is not important here, and the slot is not necessary useful but always set.

Correct me if I’m wrong, but should I use unfeaturized entity and don’t put them in stories ?