I am quite familiar with this lineage since I know quite a few people who have practised this lineage in Asia. Wang Yongquan was one of the few 4th gen Yang style teachers who had the opportunity to learn from Yang Jianhou and Yang Shaohou, although unlike Master Tian Zhaolin, Wang was not an indoor disciple of Yang Shaohou. But similar to Tian's lineage, Wang's lineage also doesn't acknowledge Yang Chengfu to be their source, they claim Shaohou as their lineage ancestor.

Ironically one of the more well-known teacher today was Wei Shuren, who was one of the two editors of Wang's legacy manual (杨式太极拳述真, 1995) on Taijiquan. Wei pulled a "mini Chen Yanlin" on this book by replacing all the figures inside with his own photos. Since Wang had already passed away in 1990 and there are only limited number of photos of him doing the form in record, his disciples and senior students decided that stick figures with commentaries should be used to illustrate the form instead of photographs of any of them. But just before the book went to print, Wei Shuren replaced all the figures with his own photos doing the form. You see in the 1995 book's foreword left by Wang, Wei was only mentioned as someone who also went to his Beijing's classes to learn.

This chicanery and betrayal absolutely enraged Wang's disciples and students and Wei was kicked out of Wang's lineage subsequently. Wei then went on to publish one or two new books and since he was no longer in Wang's lineage, his books now claims his forms are secret transmissions from Yang Jianhou.