Using wrist grabs to "develop" IP/aiki is grossly inefficient to the point of being ridiculous. There are explicit means to get there ...much faster.
And storing chi and moving energy is done solo...and doesn't require wrist grab either. All in all the entire training model needs to be revamped to get anything that is both faster and more powerful.
what I see is catch as catch can and hope for the best.
I threw the japanese teaching model out the window.
We are better.
What about it makes it so inefficient? Do you think it promotes too much arm-based strength? I can certainly see how it might add a whole new set of variables for translating the power of hara, complicating matters. I can't claim any real understanding, but I do remember a moment after doing some katadori movements where I felt like I gained an insight into how to move with more "whole-body" feel (even though I know my best "whole-body" movements are pretty lousy). Something akin to that maybe?