As any pragmatist will point out, no robotic teacher ever produced exact robotic copies of itself. Even modern martial-arts barely get past one generation without a number of permutations, loss of knowledge, etc., slipping in. Look how many of the "direct students of Yang Cheng Fu" teach very different arts; look how many "uchi-deshi of Ueshiba Morihei" teach very different arts. Someone wants to tell me that I'm a "jerk" for thinking that some koryu isn't subject to the realities of life? I think it just got proven.
I think the koryu don't much care what you -- or any outsider -- think of them. I think that was Threadgill Sensei's point.