Re: Maai, Musubi ?
I think that it is important to understand the concepts, but you train them through doing aikido holistically. I personally would not single these things out as because if you concentrate on them, well, you are missing other things.
I'd experience aikido as aikido and learn these concepts over time as you gain an understaning through your total experience.
I like Lynn Seiser's concepts, they really drive home what is important, it is not the hand position, timing, and technical stuff...it is the experience we gain through our senses.