George S. Ledyard
But this does not mean that what we do cannot be effective as an empty hand art, you just need to adapt the principles to a different reality. If this is your interest, you need to work with folks who can execute strikes as they are found in karate, boxing and muy thai. Work on application of ones technique with a wrestler, judoka or mixed martial artist. Put some time in with a kali or silat practitioner on knife technique.
Well yes and no.
If you literally mean the principals of Jiu and Aiki as found in Aikido, then yes sort of. However the techniques of Aikido (shihonage, jujinage, Sankyo etc. etc.) cannot readily be adapted to unarmed fighting. In fact it would be really silly to try. The whole of Aikido's technical syllabus is simply not an effective means of unarmed fighting.
To make Aikido an unarmed system you would have to add lots of techniques to it (boxing skills, wrestling skills, and throwing skills). And you would have to add tons of new forms dealing with common unarmed positions. Why do all that when you have a perfectly understandable readily usable weapon system at your disposal??
If you are good at actual weapon fighting (like say the dog brothers), you will probably do pretty well in an unarmed fight against a novice. The reason being, that you are comfortable in confrontation. You know what it's like to take and dish out pain, and you know what it feels like to have someone aggressively coming at you. You will coupe with the stress much better, and likely come out on top. But if you think a trained weapon fighter is going to be as good as a trained unarmed fighter in an unarmed situation, you are kidding yourself.
To be for sure the opposite of this holds true as well, an unarmed fighter is likely going to lose his life to a trained weapon fighter in an armed situation.