Re: Has anyone surpassed O'Sensei?
It's like saying: does any fruit taste better than apples? You can't compare O-sensei to any other sensei. Once an Aikido master get to a certain level they start forming their own special style with emphasis on what they think is great.
O-sensei was unique, so is many sensei that you see today. In Japan and outside, in hombu dojo and in other styles. Some even went in very different direction with Aikido turning it into something new.
To judge who surpasses who.. well... It's not a question that can be answered I think.