Dosado to a Wave is a Dosado followed by a Step to a Wave, all done as one smooth motion.

But since it is all done as one smooth motion, the final action of stepping ahead to take right hands can be considered to be a continuation of the Dosado. So you can, if you prefer, think of Dosado to a Wave as just "a little more than a full Dosado" (more specifically, a full Dosado plus another 1/4 of a Dosado, for a total of 5/4 of a Dosado).