As I note in HIPS, Sugino sensei recalls, post-war, accidentally meeting Ueshiba and the latter asking him to teach him TSKSR spear (which is, in fact, rather unique). Sugino replies that he is unworthy, he'll send his teacher, and Ueshiba replies that he'd rather learn from Sugino.
I once asked someone knowledgeable, but outside of any koryu, if Ueshiba had ever met Otake from TSKSR. The answer was, "I believe he did". Nothing certain, mind you, but if Ueshiba had met Otake ... there might be a lot more to the situation with Sugino.