What makes Isoyama a "first generation" student? He was born in 1937, a time when men like Tomiki, Shirata, Shioda, and Mochizuki had already spent several years studying with Morihei at the Kobukan. Isoyama achieved dan rank in the mid 1950s. He is junior to many men who are clearly second generation students, like Saito, Yamaguchi, Tada and Arikawa. Some of Isoyama's seniors were "soft," like K. Ozawa; some of his juniors were quite "hard," like Chiba. So its difficult to make sweeping generalizations about how, allegedly, aikido became namby-pamby right after the war and its budo flavor was lost.
Oops, I fat fingered and typed incorrectly. It's wasn't my intention to make a generalization. Rather it's more important to bring about the forgotten COMBAT nature of Aikido that Shioda, Mochizuki and
Isoyama preserved. Clearly Aikido is budo to some and not to others. We can respect and accept what ever path a person takes with there Aikido.