Both have knowledge but use in different ways – H to control; F’s is curiosity.
Hooper exploited Kingshaw’s weakness but Fielding tries to teach Kingshaw
Fielding’s strength is based on his security and his normal family life – he’s moral.
Hooper’s strength is based in his lack of conscience. There is nothing he won’t stoop to.
Kingshaw isn’t weak but he is insecure; he has the moral high ground but his weakness is his inability to exploit others i.e. his morality is his undoing.