I believe that Minoru Mochizuki's goal was to create a better martial art not a better aikido.
I think it was both to do the best aikido he could do and the best all-around martial art he could do. And to him, the best martial art would naturally use aiki. While modern yoseikan is a single art (though I thought they had "divisions" for aikido, judo, karate, kenjutsu, etc.), Minoru Mochizuki maintained an "aikido" class until he left Japan at an old age (mid-90s, I think, around the year 2000).
Anyway...I see you're in Perth. Have you trained with Unno Sensei, Mochizuki Sensei's old student?