I'm not 100% sure, but I think once you book through a AAATA, everything has to go through them. We booked through AAA last April, and I couldn't even bring up my reservation on the DW website.
Also, don't assume the AAATA will know about the discounts as soon as you do (especially if you're watching these boards

). There was a room only deal last April, and when I called my AAATA to ask her about it, she wasn't even aware of it! These boards are way more on top of things!!!