Most of us don't find it strange at all, if you remember Jenn says she want MC to fuck her and has much more content in the game than Olivia does.
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Jennifer will be in chapter 2 at the start but we have no info on Olivia.
The primary NPC is D.
Then we have top level secondary NPC's and they include Elena and Jennifer.
Then we have secondary NPC's that include Georgina and Olivia. (Depends on how you play it Georgina could become top level secondary npc.)(Olivia may become a top level secondary but we will need more info on this.)
Then we have the all the rest of the NPC's.
This is how I see it at the end of chapter 1.