I am not in any way calling your skills in to doubt however if I (and I can't now lol) fully fired up Kotegaeshi then your wrist would break
Also I don't know many boxers who can counter an Aikido joint lock or learn how to absorb a dynamic Irimi Nage for example.
As for resistance, believe me every time we use more resistance in the attacks it's easier to control the Uke, what is difficult is to control a relaxed fast Uke who instead of resisting he is trying to counter you, if that's what you mean then, yeah we do that.
Counters are resistance. Resistance does not mean the same thing as tension. Resistance is the thing you need in your training, and relaxation and counters are part of how we resist aiki techniques. As is controlling our weight transfers and keeping center and structure. Have your partner do those things and find out what causes problems. That's training with resistance.
We agree then. If by resistance you mean being relaxed in order to be able to counter the techniques and re-attack then yes, that's part of our practice, an everyday part.
If someone decides to stop a technique from being applied, he can either try to counter it using another technique or try to tense up physically and try to outmuscle the technique.
I'd like to expand on gpseymour's point, because I see frequent miscommunication sometimes when these discussions of "compliant" and "resistance" come up.
"Resistance" doesn't mean that (for example) uke waits until nage has a full-fledged kotegaeshi locked on and then tried to muscle out. That's just asking for a broken wrist. It would be like applying "resistance" in a boxing match by waiting until someone punches you in the face and trying to tense up your nose to resist the incoming fist.
"Resistance" or "non-compliance" involves imposing your will and your techniques on the other person while not allowing them to do the same to you, using whatever methods are allowed within the confines of the current exercise.
Getting back to kotegaeshi as an example ...
Typical application of kotegaeshi involves several steps:
Gaining control of the opponent's wrist
Using that control to break the opponent's balance and structure by leading him to overextend and compromise his alignment.
At the same time, nage will be moving off line, gaining a favorable angle relative to uke
Compromise the structure of the opponent's wrist through flexing it.
Finish by applying outwards rotation to the compromised wrist.
(There are additional details, such as leading the opponent to shift his body weight one direction then applying the kotegaeshi in the opposite direction to increase the destructive power of the lock, but I think I've covered the high points above.)
In true "non-compliant" randori, your opponent will
Try not to let you get control of his wrist
Try to break your control if you do get hold of his wrist
Work to avoid having his structure or balance compromised
Work to regain his structure and balance if it is compromised
At the same time, the opponent will be working to gain a favorable angle on you, compromise
your structure and balance, and apply whatever techniques he knows (strikes, throws, trips, etc) which are allowed within the current exercise.
Ryback posted that "
Also I don't know many boxers who can counter an Aikido joint lock or learn how to absorb a dynamic Irimi Nage for example." The boxer's method for countering an aikido joint lock is to not let you get control of the limb in the first place and not allow you to break their structure if you do manage to grab a wrist. As for irimi nage - if you are able to apply irimi nage that generally means that you also had the option of applying a really solid strike to the face or throat. Boxers are pretty good at not getting hit.
Please note - none of this is intended to trash Aikido or take sides in a style vs style argument. I'm just clarifying what we're talking about with "compliance" vs "resistance/non-compliance."