George, Ueshiba ultimately was able to form his world view and espouse peace and harmony BECAUSE he had the physical skills and power, not in spite of or in rejection of them. Those skills allowed him to be peaceful BY CHOICE, not because meekness was forced on him because he was unable to physically defend himself.
If anything, internal conditioning skills allowed him to show how physical power could be used in a way that did not harm an attacker, but kept the attacker from harming him.
Ueshiba also seemed quite pleased and to have no depletion of glee in that physical power, or demonstrating it, as an elderly man. That is pretty evident in all of those YouTube videos of Ueshiba bouncing big, young men off his chest, knee or shoulder, and all that good stuff.