Sure, its a common plot device, but the story arcs address different issues (or themes). Its the same with OSC's work. Ender's Game was writen to give OSC a character with the back story he wanted for his main character in Speaker for the Dead. It then went on to win the Hugo and Nebula awards. As did Speaker for the Dead. In which Ender is 30 or so years old. Not a kid any more. Ender's Shadow is a re-telling of Ender's Game, but from the point of view of Bean, a genetically altered kid born in a test tube with off the chart inteligence, who, upon reaching puberty, begins to grow out of controll. Seventh Son is a book about a child born the Seventh Son of a Seventh Son, a rather "magically" (for lack of a better work) potent combination in a world where people have "magical" knacks, and things like hexes and jinxes and curses really work. In Red Prophet, Alvin Maker (the kid from Seventh Son) is a little older, and is trained by a Native American Prophet and his brother in the ways of the "Red Man." Then, in Prentice Alvin (book 3) Alvin is into his teens (pretty the equivilant of a College Student, IE not a kid) and is sent off to apprentice with a blacksmith. And of the 20 or so of OSC's books I've read, those 4 (Ender's Game, Ender's Shadow, Seventh Son, and Red Prophet) are the only ones that focus on a "child of great power set against the backdrop of a great event and ensuing results" So, tell me again how that's 3/4 of his work? Because, even if the 5 or so books of his I haven't read are about kids, that's still only 9/25, which is much less than 3/4.