Anonymous....it's a sport, but artisitic interpretation is the prime object still.
At the risk of sounding like a cracked gramohpone record (what's the modern equivalent, i wonder?) dare i mention that while lloking up Alex Moore's book on the slow waltz natural turn, i read the introductory stuff, including the description (and picture) of the hold and setup. He says the man stands directly in front of the lady, that in practice this isn't possible, so the man has to be a little to the side (9th edition, this is).
Things are changing.
THe elbow thing - i spent a long time trying to get my left elbow in line with my back. In the process i develoed an impingement injury in my shoulder, which took a full 18 months to recover. THen i heard that the elbow should be in line with the cnetre of the body (not the front of the rib-cage). This central position is HUGELY more comfortable.
There are different views on this obviously (as in most things). I just wonder what most judges are looking for.