In reply to Chris Craggs:
Maybe the confusion has arisn because there is no line for DD in WG (presumably to avoid cluttering the photo, and possibly not helped by the fact (on your conventions) the rising traverse line for MR is too low (below the foot traverse in places). Your descriptions are OK so its not that hard to work out wher it goes.
I think its important people realise how easy it is to make the odd mistake on topo lines in guides and to read the descriptions and if anything seems odd to follow climbing nouse and not follow a line blindly.