What do you mean by resistance?
As I said in another post, define resistance. Usually there is a misunderstanding with this term.
Resistance is putting effort and strength in order to stop the technique from happening
I'll repeat something I said in an earlier thread ...
"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.
If you have examples of Aikido folks training with this kind of resistance, please post them. The only things I've seen along those lines are Tomiki shiai.
Why don't you if you are so emphatic about wanting evidence actually go to an Aikido dojo state your case and see if they will let you practice?
If I knew of an Aikido dojo that was open to that sort of practice (especially with a visitor from a different art), then I would love to visit them.