Ender is a Third. Is it a positive or a negative fact for Colonel Graff? Is it a positive or a negative fact for his own self?

Ender is a third child in a society where parents are only allowed to have two children. His parents were given permission to have a "third" because of the promise his siblings showed..... in the end, they weren't good enough for what the program (government) had planned for them. This put Ender in the position of being different (a third) and of promoting an enormous amount of jealousy (Peter). Ender comes to accept his differences and even embrace them. Graff needed a child that had his own identity and sense of duty.