Terry Dobson was fat when he got old, partially because of his failing health, but Terry Dobsen was chosen by Morihei Ueshiba to be the inheritor of his school. He was quite the badass, and Ueshiba was one of the most revered and respected martial artists in Japan before ever founding Aikido.
Steven Seagal is no Terry Dobson.
It's sad that most people associate aikido with this hippy new age dancy shit, and with Steven Seagal. Real Aikido is really fucking hard and you get bruised up pretty good.