For some reason it won't let me edit my post - but I should have written that you descend from Aonach Beag over Stob Coire Bealaich and then into the bealach between Stob Coire Bealaich and Sgurr Coinnich Beag - the rest of the description of the descent is the same but refers to descending further south of Stob Coire Bealaich rather than Aonach Beag and contouring round to the bealach between that and Stob Coinnich Beag. Hope that makes sense and I haven't confused you!
Vicky

Thanks Vicky. I've done the Aonach/Grey Corries traverse before, but admittedly with full winter gear, which of course I wont be carrying on the TGO. It's good to know some of the tricky parts could, at a pinch, be avoided (if snow conditions allow). It's probably asking a lot anyway for it to be safe in mid May with kahtoola spikes, but I may just include it as a possibility.