From the time we get introduced to Qiao Feng, he is already established as amazing powerful with little to adequate detail about how he got there.
Xu Zhu luckily gets 70 years of Internal energy and then even more later all by chance and happenstance.
ZWJ stumbles onto 9yang and QKJDN. However, he did suffer from the xuan elder's palm and plus his parents both committed suicide.
GJ accidently learns all of 9yin. Gets the opportunity of a lifetime becoming a disciple of Hong Qigong and learnign the 18 dragon palm.
YG gets his hand cut off and is seperated from his loved one to learn the good stuff.
How had the easiest route to becoming an elite martial artist? My vote goes for XU Zhu