My approach is based on my years of extensive research.
Not the other way around.
Are you sure about that? For someone who claims to have done such research, your views are noticeably off base. How many koryu jujutsu schools are you familiar with?
I am very sceptical of these stories from guys nobody can even ask anymore. But is interpreted by some sort of disciple.
It gets very cult like to be honest.
Again - you know this how?
I'm confused as to how you come to frame the knowledge I referred to above in those terms - what makes you think anyone is talking about 'stories from guys nobody can ask anymore'?
When you learn a BJJ technique, and hear some of the history around it - the famous 'kimura' for example - do you immediately dismiss the technique because you are being told 'stories from guys nobody can even ask anymore'? Or does the historical background simply add some further context and at times technical or tactical information to your understanding of the art?