Cho family lineage has been posted a few times by Hendrik already. Below is the Lineage as I have be told in Singapore and Poon Yee, China:

Yim Wing Chun
Leung Bak Sao
Cheng Dan Kam (Yik Kam)
Cho Dak Sing (CDS)

Hendrik would include Cho Shun, CDS's father, but he did not learn from his father but directly from Cheng Dan Kam. But because his father also learnt from Cheng Dan Kam then as tradition dictates a son and father can not be at the same level. Therefore when including the father in a "full" family tree CDS would be a level lower so it was explained to me.

As you say you live and train in Fatsan etc why don't you ask your Sifu's if they heard about Cho Dak Sing 曹德胜. Then you may have a lot of answers and maybe a bit of respect for the Yik Kam (Cho Family) Lineage.

How you talk to Hendrik about his research and idea's is between you both.