A blackbelt in Aikido means nothing in terms of fighting skill. Everyone long enough there gets one. You just have to roll around and do some light drills.
small joint manipulation is great against untrained fatties but helps next to nothing in a real fight when learned in Aikido.
Aikido is the least helpful style regarding these tactics because its full of the esoteric crap their founder wrote down. Ueshiba learned Aiki Jutsu (which is worlds more effective and complete) and took all the techniqes out that did not conform with his ideology. Aikido is a castrated dumbed down version of Aiki Jutsu.
Especially as Aikidoka train very soft and have no sparring, they are not the slightest prepared for a real confrontation. In our town is a very big Aikido school with 17 black belts and I would bet everything on some (not fat
) slightly talented sherdogger doing boxing and a little Judo for 3 months to beat them with ease.
I get it its fun to roll around. Why not, but many men/women training it are completely delusional about their fight ability. The ones you meet and are competent (I met one) have their skill from other MA`s.
For the ones interested do one drill. Try a aikido wrist manipulation and be happy how easy you bring the other person down (careful). Now tell the opponent before what you will do and he should resist with maximum muscle activation (like in a fight). It will be near impossible for him to execute the move if he is not much stronger. Sure with time you may get it but in a real sparring situation you have eaten several counters in that time frame.