The main characters in LOTF and The power of one didn't have power right away.  They earned it, but the difference is that Ralph lost the power to Jack, and Pk went through the movie trying to earn it.  Ralph had the power to rule over everybody on the island.  But PK gained power through out the movie, like the power to fight, and the power to learn.  The bully at the school in the beginning of the movie had the power like Jack.  The Bully in the movie maintained the power cause he was the oldest and he was ruthless one, he was also in favor of what all the other kids wanted, that's why he was so popular.  That goes the same way for Jack, he gained the power, because the other kids wanted to hunt and have fun, and Ralph wasnt like that.  In the power of one, the power structure is made up of 1. the whites, and the ones with knowledge (education).  IN The LOTF it s the one who has the conch shell.