But I will say this though: CMC was never known as a fighter, and there were many who questioned his fighting skills. However, due to his close ties with Chiang Kaishek, being Mrs. Chiang's art teacher, no one dared to challenge him or make him lose face.
Why is this important to bring up, does it speak to his skill or lack of.
You say you never met the other teachers in person and yet feel confident to comment on their skill...
as taught to your grandfathers uncle.
As mentioned in the article different people learned different things according to their level and ability.
Did your grandfathers uncle have any skill?
The teacher's I've met or studied with, Ben Lo, and Professor Chi,
both had skill but in different ways.
I think its up to ones self to test and confirm usage and understanding of "their"
work regardless of who the teacher is or was.