I don't say that the Yang's didn't know the "Pao Chui", but only that it was not a part of their curriculum.
Maybe the "Lineage Chart" ( http://www.geocities.com/oldyangtaijiquan/lineage3.htm
) seems only a speculation, but I think that it make sense.
The percentages of hardness and softness are only approximations to show (understand) the developement.
Chansigong or "silk reeling" isn't a 'hard style' or 'external' but that (Chen's) Chansigong is 50% internal and 50% external.
Maybe tne name "oldyangstyle" is a bit misleading. I am not saying that one style (Yang, Chen or other) is better than another, I only try to (you can call this a speculation) clarify the Taijiquan developement.
O.K. My opinion is "Chen Chang Xin was teached in "Pao Chui" (traditional Chane Family martial art teached to him by Chen Bing Wang) and "Taijiquan" (a martial art from the outsider Jiang Fah). Chen Chang Xin has two main disciples: Chan Gen Yun (we can call it Old Chen Taijiquan) and Yang Lu Chan (we can call it Old Yang Taijiquan). Is said that Chen Chang Xin teached the "Pao Chui" by day in the Chen village practice place and the "Taijiquan" by night in secret. Yang Lu Chan was not teached in Pao Chui (because it was destinated only for the Chen Family members and to his teacher was prohibited to teach it because his outsider teacher) but only in Taiquan." You may not agree with it, but is the only possible explanation.
How I said I am not trying to discredit nobody, only to make things more clear. There is not a exact point of view of the Taijiquan hostory, I am nobody but the real masters talked about it!