Thank you. That text clearly shows that Guo Jing was the better archer than most Mongolian generals except Jebe. Most of them could shoot the eagles down when they were flying low. When the eagles flew higher, the generals couldn't, despite Temujin's promise of a reward (you'd think that they'd be tripping over themselves trying to shoot a few down eh?).
I don't get what you're trying to say with your last paragraph. Do you mean that he's only a good archer because he's stronger and has better precision than others?