Re: Aikido vs Brazilian Jujutsu
My experiences in aikido and sport grappling have lead me to believe that it ain't about techniques at all, it's more about the principles of movement that you train and how well you can apply them, regardless of what the other person "brings". Techniques are just a way of expressing principles.
'Course, it helps if part of training the principles involves other people "bringing" something valid that you have to deal with (be it strikes/grabs/locks/etc. from arms-length/clinch/ground/etc.). But then I think that folks, regardless of art/style, that want to be well-rounded, are going to find ways to address it.