In reply to furbrow: I had to get the map out for a quick look. Are we talking the watercourse running over Creag an Steallaire? It doesn't look very steep from the map. Was it long and steep enough to make a worthwhile route?
Talking of Stob Ghabhar, I found a good looking new winter line in Coire Dhomhnaill a few years ago. I went in to have a look, but it was not in good condition. Then out came the SMC Journal and there it was, already climbed - The Great Divide - can't remember what grade it was given.