I think that choosing the Yoseikan as representative sample of Aikido you are being as unfair as Thornton. .
Coulda gone with Tomiki. I've seen some Tomiki that was very soft, people that were flacid....but I've seen some that was pretty rough. Or we could go with some of the Yoshinkan people. Mainly, it's all the prewar teachers and their descendants that stayed pretty rugged. That's what I think of when I think of aikido.
I will admit that most people don't think of those things when they think of aikido, but they have an image of a guy who's 50% overweight with a roomful of students who are either 50% over or 50% underweight, smiling insipidly as one pretends to throw and the other pretends to be thrown....
But as I say. I don't consider that to be good aikido and you can't go mess with someone like that and think now you know what all aikido is everywhere in the world.