"I am not talking about expert competitive dancers. I am talking about social dancers, who during basic Waltz steps pop up and down at the end of the measure. They don't do a gradual rise, it is a pop up at the end, like the original message was talking about."
Dennis,
I don't believe the original post was talking about popping up on three. The mention of rise there was merely the conclusion of what began earlier, and it's turnaroudn into fall. The question seems to have been how that was all to fit in, with a (grossly erroneous) theory that it's accomplished by finishing the foot closure on the and after two.
As for late rise; two issues. With beginners, it's mostly a matter of the lack of foot strength to execute a smooth rise.
With more advanced dancers, there's a certain (flawed) school of thought that you can get more dynamic by doing a kind of ski-jump action as you pass over step one, staying down and compressed and then exploding up. That puts the lowest point of the swing over step one. In contrast, the proper way to do it is to put the lowest point of the body's height in between steps 3 and step 1. There's of course a lot of softening of the knee as you move onto step 1, but not so much that you actually continue to loose altitude. Instead, you are already softly gaining a little altitude as you move onto the foot.
And then there's the often overlooked detail of proper foot timing: specifically, the leading teachers will point out that the standing heel needs to have broken free from the floor *BEFORE* the moving foot passes it to end step 1. This is very critical to getting the hips going into the upswing. One could easily overdue it of course, but done right it is extremely beneficial. There's one frame on the Blackpool foxtrot 2006 video where you can just see Howson's heel lift before the end of step one of his feather.