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You can’t make two NPCs of the same character spawned.
Let’s say for an example: In a fresh save, if you beat Bella (Or any first predator you’ve beaten), select Student Predators and then go back to the one you already beat, the Student Predator won’t spawn if the Apex version of that already existed.
That’s not a glitch. In fact, that’s possible. The game only checks if the Apex Predator exist that prevents the student predator spawning, not the player. So you can still have you being as Bella and the existing Apex Predator as Bella, but the Student Predator Bella won’t spawn because the apex existed.