Guo Jing and Yue's Eagle Claw? I recall nothing about this in first edition, don't know about other version. Maybe mistaken it with White Skeleton Claw?

Yue Fei is simply the best. In martial arts, he is probably at least at the 3rd or max at 2nd level best fighter at his time (yes, there are some better fighters during his lifetime, it's just they are less famous. For example: Cao Ning )
And that 500k, it was more like 100k.