Por que Pol Slattery troca os exércitos depois de se tornar um comandante?

Quando Ender encontra Pol Slattery pela primeira vez, ele está no comando do Exército Leopardo.

The enemy was Leopard Army. It would be easy. Leopard was new, and it was always in the bottom quarter in the standings. It had been organized only six months ago, with Pol Slattery as its commander. Ender put on his new battle suit and got into line; Bonzo pulled him roughly out of line and made him march at the end. You didn't need to do that, Ender said silently. You could have let me stay in line.

Quando Ender o vê três anos depois, no entanto, ele está no comando do Exército de Texugo.

They won, of course, but it was a grueling affair, with the battleroom so filled with a labyrinth of stars that hunting down the enemy during mop-up took forty-five minutes. It was Pol Slattery's Badger Army, and they refused to give up.

Por que ele trocou de exércitos? Isso já aconteceu com os comandantes?

Além disso, com base no seguinte, ele provavelmente teria 11 anos quando se tornou um comandante,

"Content. He's doing well. His mind is keen, his play is excellent. Young as he is. we've never had a boy better prepared for command. Usually they go at eleven. but at nine and a half he's top flight."

---

Carn Carby came to Ender as soon as he was unfrozen. He was a twelve-year-old, who had apparently made commander only in his last year at the school. So he wasn't cocky, like the ones who made it at eleven.

---

Ender watched from the corridor. Pol Slattery was young, but he was sharp, he had some new ideas.

que faria dele algo como quatorze ou quinze anos e meio depois. O que ele ainda está fazendo na Escola de Batalha? Mick diz que ele estava ficando velho demais quando tinha apenas treze anos.

A bigger boy came to sit by him. Not just a little bigger- he looked to be twelve or thirteen. Getting his man's growth started.

"Hi," he said.

"Hi," Ender said.

"I'm Mick."

"Ender."

[more dialoge]

"Yeah, funny, but no joke. I got nowhere here. I'm getting big now. They're going to send me to my next school pretty soon. No way it'll be Tactical School for me. I've never been a leader, you see. Only the guys who get to be leaders have a shot at it."