Well I can't argue with that. (One can argue about what he said/meant, but opinions about him and his abilities are just that, opinions.)
I can't quite agree with it either-- if I did feel that way, I would be one of the many folks who do not practice aikido.
I have to say that aikido is just one of the martial arts that I have practised along the way and it is one of my favourites, I still practice karate and gung fu movement as I find it fits in well with my aikido, which is eclectic but still based heavily on the Tomiki/Shodokan style....
I used to like judo, but do not practice anymore, but still used to whip in the odd waza for a change while applying aikido principles, I think it is all part and parcel of the same thing, being adaptable....my students liked the change from time to time as it gives them a broader outlook