Well, that's just weird.
If you're not awakened, you start with magic 1, if you were, just barely, you start with 0?
Naw, I don't think that's intended. Why wouldn't mundane characters start with 0 and have to raise it then?
Sides, not being dual natured has some massive advantages for non-magicians, namely astral beings not being able to pick on you with impunity from a few meters away. I could see people doing that on purpose to create mundane Infected. I know I would.

As for the first part, I didn't miss that part, the thing is that that line and the one I quoted contradict themselves.
As it is written, you don't gain magic, then lose Essence, you lose Essence, then gain magic. At least that's the order it is written.
Given that
other infected can overcap their essence or temporarily raise it, I'm not so sure about the rules that normally apply applying here. I mean, that's why I ask.

Edit: I want to point out that I agree that it
should just be 0 magic. I'm just not so sure.
Edit2: Thinking more about it, I suppose it's like with other maximums; You gain one magic, limit is 0, you have 0.