The same could be said for pro wrestling though. You can SAY anything works. All we truely have to work with is the vast repository of video evidence and/or first hand experience. I've examined many hours of aikido footage, and regularly spar with a guy that knows aikido. When I go limp for him and cooperate he can throw me around in cool ways, but in sparring he only gets people with sweeps and shoots. Throwing a guy by his wrist(unless you count a head and arm throw) just isn't something that happens, at least not very often.
Even in that aikido vs aikido tournament clip I posted there aren't any throws like that.
Now this isn't to say I think aikido is useless, because I don't. It helps movement, stability, and flow. It really seems to help with cadence and timing too in the clinch. It is, IMO, as osensei intended, a great thing for a trained fighter to supplement his skills with.
Well I don't know if everything works but most traditional Martial arts have the potential to work if the person practicing them has the skills needed... Aikido, Tai Chi, Wing Chun, Aiki-jutsu, you name it.
And of course sparring or combative sports is not the way of the warrior so we don't measure Aikido in such a context... And furthermore Kote gaeshi is not the only aikido technique. It works when the situation calls for it as it is with any other technique.
As for sparring or testing or experimenting with an aikidoka... Well, in another thread I saw a YouTube link of someone supposedly using Aikido to fight an MMA guy and completely failing.... So everyone's thoughts are probably "well, Aikido is useless against the MMA guy", but....the fact of the matter is that the aikidoka is lousy in his Aikido. In the whole video his posture is bad, his movements very far away from the Aikido way of moving and, to make matters worse, he is not trying a single Aikido technique, anything!! He looks like he is going for his legs or doing other lousy, monkey mumbo jumbo and he is claiming to be doing aikido.
The guy is a bloody joke! He is, not the art! And that's not bad, nobody is perfect but you don't post a video on YouTube demonstrating your incompetence and blame it on the art.
And by the way, I think we should stop trying to decipher what o'sensei wanted, what o'sensei said because o'sensei was saying a lot of things, mostly in Japanese, a long time ago and maybe he was changing his mind every other day. So to claim that o'sensei wanted Aikido to be a supplement of other martial arts skills is at least naive...
There were people in Aikido that had previous martial arts background and they were close to o'sensei, like Shioda... Neither he, nor Saito or Tohei or whoever ever claimed in any of their books that Aikido needs other martial arts experience in order for it to work... And also in my experience, it doesn't! It is a complete martial art as much as it can get(and so are others too of course).
One just needs to study hard in order to get Aikido's principles inside Aikido's techniques to make it work. It's all on the individual person, the art is perfect, all martial arts are perfect. The openings and flows we see in them are people's lack of perfection. Believe me I see a lot of this in myself, but I am working on it....