There are conflicting tales of whether Wu Chien Chuan, Chuan Yau's son, ever took instruction from the Yang family.
It depends on who you ask, but all concerned say that he was primarily his fathers student.
He did, however, open a school with Masters Xi-Yiu Seng, Yang Shou Hou and Yang Cheng Fu, where they all taught together for a number of years. This was the precursor of the Beijing Institute of Physical Education, which it became known as after it was recognized by the Ministry of Education due to the excellence of it's instruction, and expanded.
Clearly, at this point in time there was no division among the Masters. I find that holds true today. The Masters don't seem to have any problems between the styles, it is their students who have created the "styles" by insisting thier preferred "style" of TCC is superior.
I am doing my best to escape that trap by "crossing over". I would like to say that it was altruistic on my part, but it was purely necessity that drove me. I had no other options to continue training TCC after I moved to my present location and was in no shape due to a physical injury to continue training on my own.
Now that I am back in fighting trim, I have come to have a genuine respect and love for Yang Cheng Fu style TCC beyond the original purpose of getting myself healed from the injury.
The deep, wide, expansive jing I have discovered in YCF style is so different from the narrower, more concentrated jing found in Wu style. I don't believe one is better than the other, but I do recognise their differences.
At WTCCA there is still a bit of the "no pain, no gain" attitude learned from Yang Ban Hou and passed on by Chuan Yau to his son. In fact, when learning meridians in Wu style I was often told that the only way to learn these meridians was to injure them repeatedly, so there could be no doubt as to their location. The pain leads you to become familiar with them, very quickly, and you are unlikely to forget them.
However in learning the same meridians in my YCF classes a simple push of gentle jing through the meridian leaves you in no doubt as to it's location. It's not as fast of a method, certainly, nor does the lingering pain remind you constantly of the location, but it also doesn't leave you limping and wishing for pain killers after class.
The "no pain, no gain" method of training does have merit, but after seventeen years of "no pain, no gain" it's been sort of nice to learn a bit more kindly and gently.
The "no pain, no gain" method of teaching fighting applications does teach them quickly, as you learn the proper method to avoid the pain in jig time, but showing someone the method gently and slowly a few more times seems to sink it in just as well without all the ice packs and aspirin.
Still, I do miss the "no pain, no gain" method for it's directness and it's familiarity.
Funny what you learn to enjoy? Isn't it?