If one looks at an Aikido practitioner, uniformly the ones who stand out have some weapons background, usually sword. It is fairly obvious. usually those folks do bokken work. The ones who do paired bokken work look even better. Their intention is clearer and their tendency to muscle is less. But when you see folks who are familiar with using an actual blade as you do in iai, it is even a step up again as you see a precision and clarity that you don't see when people just do empty hand. If you get a chance to actually cut with a sword you find out just how precise things need to be. the tiniest bit of an angle change and the cut doesn't happen. When folks who have this training do empty hand it is pretty apparent.