In reply to Anonymous:
> (In reply to Marc C)
> I would be interested to hear of (m)any new routes that have been established in the way you describe, especially any that have such a wild grade discrepancy that you suggest.
Wasn't Longland's route "Javelin Blade" (E1) first ascended when he mistakenly thought he was following "Javelin Buttress" (VS)? A pretty wild grade discrepancy for 1930.