BBM I was thinking about illness or a possible accident. One of my kiddos had a lot of hair shaved to have tubes inserted in her head. Also I was wondering about hair being pulled out, either by Josh - some people do that - or someone else.
It probably doesn't mean anything, I was just curious about the hair-growth pattern.
It's always interesting to see how people analyze things here, but I think his hairline or lack thereof is probably going to be a non issue. Again, my daughter has the same (she is bi-racial b&w) and I can assure you she's not sick and no one pulled her hair out...the same for my nephew...I'm going to try to post pics...

