Re: Aikido on the ground, questions.
Michael, let me rephrase my argument, which doesn't clash with yours at all.
What I meant is that from my limited experience in BJJ and watching BJJ fights, a ground fighter will try to get his opponent to the ground. Which on the street is not always the best idea.
If you end up on the ground because your opponent threw you or you tripped or something, there's no question that BJJ skills may save your life.