Re: Locking/pinning as pain submission...
I was refering to your experience with Sensei Gleason and the "wrist turning" techniques. If someone has a relaxed grip, is controlling your center by only touching your hand or wrist, and there is no pain then they are doing proper skeletal locks. If you can't feel it then the nage is good enough to know that "you can't resist what you can't feel". Or you have suffered nerve damage.
Don't get me wrong, I know that aikido can hurt, but it shouldn't have to. Of course the landings are up the the uke.