Re: Are we really doing O'Senseis Aikido?
Another point is O'Sensei's aikido changed with age and personal development. It is often said his pre-war aikido was comparatively hard.
With regards to differing training regimes, each to their own. My sensei studied under O'Sensei and his aikido is very martial and hard, but that is what you get after almost 60 years of perfecting the basics (he also flows very well).