That's still very bald, nice of him to show his results properly as it educates people. Apart from the density issues which were a given considering his position, that hairline lacks artistry. Way too straight and stalk like.
I hear you, as transplants simply mask genetics

He may not get your aggressive genetics depending on your future wife's family. I do wonder for my boy what will happen, my genetics are not extreme anyway, was Norwood 3 at 25 and stayed like that until 30s and for my girl everyone is a full head, incredible hair too. Only her grandad went slightly bald but it was just a little at the front and from my side it's mixed, you can be full head, slightly bald to full on depending on which side of the family it is. It's difficult to predict anyway as "throwback" genes can come from many generations ago.