clapo. i wouldn't worry too much about the concentration. it will catch up given time. grady allison started out a respectable/woeful bowler iirc. he is now wonderful/exceptional.
that 18yo with proficient bowling, and respectable looked okay to me. i'd have just given him 1 bat, 1 bowl, 1 stam and 1 fielding net. whilst progress is slow. it will pay off