In reply to Tom Ripley Mountain Guide:
There are a lot of Ravens all over the hillside, so I wouldn't be surprised if there were some nesting on that bit as well. They're scarily big to be honest - you wouldn't want to get in their way!
The only reported nest is however, as you say, a good distance from the more popular left-hand buttress, so I don't see how it would prohibit climbing there.
Perhaps the left side should remain open until any further sightings are made?