The qualifier is: co-operation or non-cooperation on the part of uke?
Respectfully, (refer to post #2) When done properly a connection through one finger (even with the only cooperation being a good attack from the uke who is intent on really causing a problem for the tori) is possible. If anyone has been practicing for some time and hasn't experienced this from a skillful person, they should investigate what is possible from people that they haven't been around before.
I have felt this from a number of people in the past and I guarantee you that I attack with intent to not be "cooperative". When I'm uke with anyone they have to earn the waza and I appreciate the return favor.