drop bear
Sr. Grandmaster
In some ways, it's the same thing. Maybe Tony can step in and clarify if he's reading this. Every competitor who uses throws/locks/takedowns will occasionally get that one where it feels like the other guy didn't exist. Like the guy almost threw himself down for you, though you know he was trying to stay up. That feeling is where the "aiki" is, by my definition. In the aiki arts, we train to feel the point where that's possible, and to use that as often as possible. The "pure aiki" arts train only to use that - not realistic in my experience for self-defense unless you are spectacularly skilled. In NGA, for instance, we train a lot around finding that feel, how to expose that moment in common attacks and movement, but if it's not there, we'll hit them (which often opens up a new opportunity for "aiki"). I see a lot of aiki principles in some of the BJJ I've looked at. I keep wanting to roll with a BJJ black belt to see if I'm seeing what I think I see. So, someone who is really good at almost any grappling will be using some aiki principles, even if they don't use the term.
The difference with "pure aiki" training, is that if you ever add resistance by an opponent who knows as much as you do, things stagnate quickly. If both are only willing to look for purely aiki movements and techniques, both will be attacking very softly (gentle pushes, etc.) and "feeling" for the moment when their opponent responds with a small, significant gap that allows that pure aiki response. It turns into a dance. That dance can be a useful training technique at times, but too much of it removes the training from the realities of an attacker.
If the opponent knows as much, and is willing to go non-aiki, they have an advantage. There are open moments when a takedown/throw/lock will work, but will take some moderate force (which means it's not purely aiki). The one who is going purely aiki will pass up that opportunity, while his opponent will take it...and win. The self-defense approach within an aiki art, obviously, is to train both aiki and non-aiki applications of techniques.
Do you feel that will become an issue in a MMA match?