I'm going to play devils advocate here, and say that I believe that MDA and MDMA act on different sites of the brain in such a way, that it is possible to have a full experience regardless of what was dropped first. I have seen countless people drop MDA at the end of, and the day after an MDMA experience, and achieve full effects. Whilst I can see what Folley is saying about dosing both at the same time (this is what I would do), I also see no issue with dosing either/or 20 minutes prior. Correct me if I'm wrong, but the reason "re-dosing" (if you can call it that within the first hour) is encouraged before the 1hr mark, is so you get that initial boost up-front, and are effectively adding to your initial dose rather than battling tolerance.
I have seen both methods used to great effect, so I'm not saying either of you is/isn't right.
EDIT - Just saw this argument ended in 2012 *facepalm*. More fool me for reviving a dead topic....I'll just go and walk into this conveniently placed burning fire now....