So, based on the the text and pdf, it appears that the 2-step theory wins, with a 
"kick" occuring at both step 1 and step 4.

Mark Drela wrote:
> 
> >I have been trying to work through the concepts and
> >simple physics of their explinations to gain a grasp of how DS works.
> >Well, try as I may I can not make the theories work.
> >Perhaps you can help me out.
> 
> This sketch shows how the airspeed changes during one DS orbit:
> 
> http://www.charlesriverrc.org/articles/flying/markdrela_ds.pdf
> 
> Here's some accompanying text:
> 
> http://www.charlesriverrc.org/articles/flying/markdrela_ds.htm
> 
> - Mark
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