Re: final lock doesn't work
Yes, in my experience, this is what you must do if you are not going to opt for one of the other three options I gave before. It's just that I wouldn't consider this a matter of being pinned - more a matter of being controlled. Alternately, you can also seek to capture more corners (which is what we do in our arrest and control program) - so, someone could be pinned, but this would take us away from standard Aikido kihon waza pinning architecture. In our arrest and control program we seek to capture both arms and the head - which allows us to control the hips indirectly. Once all of these centers are captured, it is extremely difficult to become unpinned.