My bros locks

here are my bros 11 year old locks.... he went natural, from what he said your bangs stay as thin dreads like you see his are, and they stay skinny because of the type of hair and the thickness as well as the movement difference of the front hair from the back.... then as it grows longer it gets weak and breaks off, hence bangs staying a shorter length. I found it very interesting and growing my hair i notice it is doing the same thing.