Just because of youth team appearences doesn't meaning he should have scoring stars. They are for players who score 25 or 30 goals a season, and if you've watched Bellion the amount of times you say you have, you'd know he won't score that amount of goals.
His goal for Sunderland:
Someone put the ball in front of him in space down the right. He ran with the ball and a chasing pack of 3 or 4 defenders towareds the goal which was around 18 yards away and into the box, slide the ball past the keeper into his bottom-right corner.