In what sense do Ralph and Piggy complement one another while dealing with the conch?

Ralph initially spots the conch shell in the lagoon but Piggy identifies it and tells Ralph that it can be blown, although he is unable to do it himself because of his Asthma. Piggy instructs Ralph in the correct technique to use to get a sound from the conch shell. You could say that they form a partnership in which Ralph leads by action and original thought but his actions are influenced by Piggy's ideas. Piggy is essentially his technical expert.