In reply to Willismorris:
No information, but I do remember wondering the same thing when walking up past them to go winter climbing on the (excellent) high north facing crags. I suspect, but could be wrong, that those lower crags beneath the hard summer routes Kinglas Crag will be a bit broken and vegetated on closer inspection - but maybe worth a look!
I'm not sure what the Slabby Crag referred to at
Beinn an Lochain is, and don't have a copy of the old guide available. A Southern Highlands expert might come along with details.
Good luck.
D.