Was my tummy tuck botched? (photo)

Unlike your surgeon I routinely repair and bring together the two rectus abdominal muscles from the very top to the bottom. This not only re-estabilshes the integrity of the abdominal wall but also avoid seeing the separation of the abdominal muslces in the upper abdomen. Unfortunately, the upper abdominal bulg can get worse with time and exercises, unless it is corrected.

Your tummy tuck result is very good, however you are right in that there is some separation of the muscles above the belly button which has become visible as you strengthen the abdomen. The fix is not a simple one as the muscle would need repair up to the chest.