“when was the last time he won on a horse that was better that 5-1. ”
The betting public rarely permit his mounts to go off at greater than 5-1. The most recent win at a bigger price I can think of is King Rasko Grey at 11-1 in the Baring Bingham.
Banbridge was 7-1 in the King George he won, probably because he was not Mullins trained.
Al Boum Photo was about 12-1 for his (and Mullins’) first gold cup, but that was because Townend was the second string rider then.