What causes companions to spawn with skill points unspent?

I remember in a previous playthrough that I had found 2 companions that had spawned with all their points (attribute points, focus points, and perks) unspent and was able to deck those companions out as I saw fit. I also had a play through where a companion was basically level 1 with no points in anything.

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What causes these companions to spawn differently than the majority of others with random points?

submitted by /u/TinyGymMouse
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