We dive with Aldora and stay at Casa Mexicana. If you get to breakfast at about 6:50, they will have coffee and the fruit bar set up. I usually have the first cup and some fruit while they get the rest of the buffet out. We try to leave by 7:20 for the 5 minute slow walk to the Aldora Pier for pick up. There is plenty of time for breakfast so no need to rush.
Aldora has several boats, I think 6, so while there may be a mixed boat of Nitrox/air divers, the boats are usually separated by skill level. I don't remember any air divers on our last few trips other than the first day check out dives.
Say hi to Memo, Jorge, Mauricio, and Shariff for me!!
Jay