DH

P.S.
Edit time ran out
The reason the letter from Sokaku to Ueshiba was important is it outlined a series of questions from Sokaku that perhaps help define their relationship- from his view. No where else are his personal views as clear. Where Ellis stated Sokaku was denigrating Ueshiba in military circles. Perhaps there is another view worth consideration. He was correct in what he said.
Takeda was obviously obsessive about record keeping and not leaving openings. Ueshiba may have been the visionary / artist / flighty personality- played out against the more grounding and stable traditional influence of Takeda Sokaku. I'm not stating a strong opinion either way as I don't think anyone really knows the truth. I'm just noting it is almost always one way- in print.