Ao Qin
I couldnt state this as fact however a popular legend which my teacher also told me and ive found commen to many Bagua schools.
Dong Hai Chan did not teach ANY of his students any LONG forms. Becouse he demanded that his students already have extensive experience he simply worked with there natural and prebuilt strengths and encouraged and changed them to suit his structure and principal.
Cheng Ting Hwa for example was a Shao Chaou master so his technique is heavy on throwing and locking
Yin Fu was a Lohan expert so his techinque is typicaly striking based.
Chang Tao Tung was a XingYi man so his technique has the same charging mentality commen to XingYi.
Dong Hai Chan its said also encouraged each of his students to create there own 'long' form which is what has commenly been passed down.
This is also what continues now with masters each focussing on there own particualar strengths and weaknesses.
What is commen to all Bagua is a similar power generation, fighting mindset and circle walking practice.
My linage only has the one long form.
Up and down, forward and backward, left and right, its all the same. All of this is done with the mind, not externaly.
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Shaped dragon and looking monkey, sitting tiger and turning eagle.
"I wonder how they would do against jon's no-tension fu. I bet they'd do REALLY WELL."
- Huang Kai Vun