Characters must be able to have more than one specific strength or back it up with a legitimate skill that can make them worthy enough to be considered “Lord of the Flies”” . Ralph surprisingly is the one who meets these criteria, he is intelligent but not a genius and compensates with the ability to assert himself, he is civilized but can snap and become a savage like the others, however the "snap" usually occurs when he is pushed enough and he is a rarity in the book, and he wants to see the people survive and advance and although he may not be as strong and skilled with a spear as Jack and his hunters remember that it was he who frightened the nearby boar by hitting it directly on the nose with his spear , he could become a better hunter than even Jack while still being able to think things through properly. This choice is a matter of process of elimination, eliminate the ones who would fail the most as a leader and you end up with the one who is technically the best leader, and that should be enough to prove that Ralph is the best choice for those children... at least until the Ralph's father won't show up to save them... it'll be fine?.....