Well, i'll join in, even though it doesn't answer my original question!!
There is power generated by the standing leg at end-of-3 as we move into 1 (i.e. planting of the right foot in a natural turn), and as has been correctly pointed out (in my view)this power is continued, with swing, through step 2 into step 3
in fact, i think there is a strong body action betyween 1 and 2 which gives the character of the dance, through the rise, sway and flight. I think this is what suomynona was saying.
Also, i believe that there is less turning of the right foot in this natural turn these days. It used to be taught that you have turned 1/4 turn on the right foot as you plant 2, but from what i've seen, top dancers turn this foot very little (maybe less than 1/8) - a lot of the turn is on the left foot when it has planted. i guess this is to maximise the additional drive from 1 into 2 to enhance the flight.
It's very difficult to talk about these things - watching good video is much more helpful