If I'm not mistaken, young Yang Guo was also a very proficient pick pocket? However, mature Yang Guo would probably be showered with rewards for all...
I think in one of the version there is stated that someone with enough internal energy need 5-7 years to learned and mastered each step of the QKDNY....
First of all, do we classified YJJ as martial arts or only as internal energy like 9 Yang, there is no external arts/stances can be used for fighting...