Training with people from other arts is a great way to test one's assumptions, with a particular eye to finding blind spots in one's own training. Many possible lessons are available, but the ones most relevant to the post I was responding to include:
* The realization that good attackers don't actually unbalance themselves much, if at all, when they attack. This challenges the assumption that the energy of an attack makes it "easy" to unbalance the attacker.
* The realization that actually completing an irimi entry against a non-compliant attacker is not a trivial matter, and potentially creates many opportunities for reversals and followup strikes.
* The realization that merely getting behind someone does not, in fact, necessarily give you control of their balance.
Something is rotten in Denmark when looking outside for things like the ones you mentioned is needed.
OTOH, Ellis quote of Dobson regarding Ueshiba's power reminded me this other one from Homma:
Speaking from experience, I can relate my feelings about being an uchideshi and uke to the Founder, Morihei Ueshiba. Perhaps only those students who actually practiced with the Founder will truly understand my feelings. As full-time students of the Founder, our respect for him was of course paramount. Especially towards the end of his life, if the Founder asked his students to "push against him as hard as they could", there was not one student among us who could do that. It was not that we were not able to physically push him, it was that we couldn't.