Shioda was pretty limited to that "one line" idea that (IME) vexes the majority of JMA- but he had "aiki" to a degree. I would never chose to move like him or (its by far, less efficient, and incomplete) but with other training in place...you still get aiki.
Maybe I am misreading your statement here, but in many of your posts on aiki, you have stated that Shioda had aiki. Now, you are saying he had aiki to a degree. How can you say what he had/didn't have when you haven't touched hands with the man? Not trying to be a wise ass, just looking for consistancy. This question is not meant to be hostile, just trying to learn about this stuff by research, examples and of course my own practice with others.