I say it's an accidental parting of his hair.
If you look closely, you can even see that the direction of the hair strands goes in different directions on either side of this part.
If you don't have that type of hair, you may not be familiar with how easy it is to do that, but I do, and I can tell you that it's an easy mistake to make.
Most black men are very careful to brush their hair so that it doesn't do that, but Zero is incompetent at everything else, so....
I've seen other pictures with a similar feature showing on the right side of his head that are shaped differently. One is a crooked line. This one is mostly straight.
Methinks there's too much tin foil laying around.