Sounds like a scarey day for all. Could it have been low blood sugar levels?
Im in a bit of a mixed mind about gag straps. One they do hold the DSV/BOV in the mouth but will an unconscious diver still hold a seal around the edges to be able to breath? At least with it out the observer can see straight away somethings not right. The diver could be ingesting/inhaling small amouts of water every breath with the mouthpiece still in place. Just my thoughts on it. Glad everyones ok.

Matt