I can give you an old wives tale about how Aikido work for me in defence of my self and in defence of someone else.
And but I am not sure how old I have to be to be old wife? Maybe I am not old enough? And actually now I think of it, I am not nobodys wife. Hmm.. so I think that rule me out completely..
I can give you opinion as someone who have practiced Aikido for a long enough while and but I think the criteria that you (and others who espouse similar beliefs) apply to what is "proof of effectiveness" are perhaps skewed towards your way or practice or at the very least set a slanted bar at a level which other MA cannot evenly pass.
I mean maybe you can say what proof do you want that you would count as sufficient proof? Ultimately if you have a faith-based belief that Aikido is ineffective in SD then it is unlikely that any anecdote I can provide can usurp the sovereignty of that faith you already hold as your truth. Likewise I cannot prove to you that your own art is ineffective in SD because it is a faith-based belief you trust in and cannot be moved. One person find it difficult to convince another out of their faith. You cannot convince me that my Aikido is ineffective. Because MY Aikido it has been effective FOR ME. Is simple yes?
Maybe you can answer me another question because all of this effectiveness stuff is lot of something the profanity filter will not allow.. And because some times you speak objectively.. sometimes mind!

Say to me why is there disproportionately more haters for Aikido than say.. well say anything at all even boiled spinach and nobody likes boiled spinach.. well except Popeye and he was more of a stand-up fighter.