It depends on what aspects you want to see from hsing I and ba kua
If he was just to imatate those arts there is no point
The follow step is a good example
Repulse monkey is another even though the way most do it is lacking any understanding
We have a 300 step yang form in our system where every step is a follow step,for example ward off,roll back,press and push are not done on the one spot,I don't know the history of this form just that it was passed down by our teachers.
Most people I see setting themselves up as authorities on SLT don't look like they spent a lot of time learning the art ,our any art for that matter
What Grahame says is right I laugh when people say what people they never met thought
That does not mean you can't trust what your teachers say but there must be honest transmission
Any break in the line of transmission,one dummie and all is lost.
It doesn't matter what art you study your teacher must have the goods or what is the use
I know people who spent a small amount of time with a very famous teacher but that was filmed
They now demand high prices for seminars all over the world and didn't get much true transmission and weren't that talented to start with
So buyer beware
I never sought out the top teacher in any lineage just those that understood the teaching
That doesn't mean that over time the top teacher didn't seek me out
Train hard,train daily,respect what you are taught and your training will be of value to you and others