That's probably why Ueshiba prefered gardening and working the earth in his later years. I enjoy aikido dojo training and the IS oriented paired practice when I can get it, but I've yet to "feel" anything from either that's on the same level as what I get from applying that way of moving to good, hard garden work.
Yard work has decent IP benefits, but spear and pole shaking is better.
I think the best stuff comes from solo and then paired training with someone who is developed themselves for a plethera of reasons. Kata is kindergarten level stuff for IP/aiki-which elbow power is an expression of- that will forever be limited due to the limitations of that venue. IME, it actually prevents