As far as the CO x Elders meetings go, one in particular stands out in my mind. They had it at Oak Glen KH in conjunction with a simultaneous DO & CO visit. They called in all the elders from around Oklahoma City. The year was about 1977, so the decline post 1975 was becoming painfully obvious.
The DO is holding forth on "doing more", not "letting our guard down", blah blah blah. He then specifically asks around the room - "why do you think the brothers are slowing down?"
You would not have believed the junk answers these elders came up with to skirt around the obvious (1975) answer. Stuff like, well maybe they are getting sidetracked with material things, lots of the young people are having families now and don't pioneer, etc.
Finally, one really elderly brother sticks up his hand and says "Well, nobody wants to say it, but I think it is because things just did not come to pass the way we were led to believe". Stunned silence for about 45 seconds.
Then the DO picks it right back up, says well thank you brother X, and then just seamlessly barges on with "OK, well how can we help get these young people with the new babies back out into the Kingdom Service" - no comment on the false prophecy; just like the old guy had never even said it.
There was one other incident where we had a particularly "free spending" CO. After the CO meeting, he leaves the room, and the Elders meet to approve his expenses. This guy could rack up about 4 times the normal expense account of other COs. I remember it got pretty interesting as the elders went through it line by line and critized every item. They ended up paying it, though, without challenging a thing.