He suggested V16! http://www.bishopbouldering.blogspot.com/I was chatting with Matt Birch about this a couple of years back when he was getting close to it himself. He seemed to think it would weight in at about V13. Interesting.
there have been many occasions where a new sequence is found ref Brad Pitt and even where the FA has failed to notice a hold thus resulting in a duff sequence and a massive down grade which if memory serves happens to even the waddliest font guru.