I think you are getting confused with the race at the festival a couple of years earlier. Auvergnaut unseated on trials day when Cantlow was a few lengths clear of him.
**Apologies - just watched the closing stages on Sportinglife and he did get hampered slightly but not too the degree that it cost Cantlow the race.
Makes sense.... I knew there was something about the race that I wasn't disheartened about regarding Cantlow... the 'not so important weight' AND losing a few lengths was it... all academic now, wouldn't have Cantlow to get ahead ever again.