drop bear
Sr. Grandmaster
I don't disagree that functional locking understanding requires something more than the cooperative drills commonly found in Aikido training. I think those can work.....but it's rare that someone only doing those (with no resistive training at all) will grok the grappling fundamentals behind them. And the aiki isn't really necessary to make basic locks work, as you know. So learning to operate most of those techniques just doesn't require the aiki study. It's another layer. In fact, it's my understanding that's how it was/is done in Daito-ryu: aikijujutsu as a layer on top of jujutsu.
Learning any sort of nuance related to fighting involves competitive drills. We are talking timing, balance being able to read or predict the other guys movements. Any of that esoteric feels stuff. The other guy just falling over is where you learn enough technique to be able to start training.