I don't think a shoe bone will be of any help. It's the leg bone of a hind (female deer) and is used for shell cordovan and other leathers where the flesh side is compacted to form the top. (Used with shoe cream it will remove scratches from the top of suitable leathers). How would you describe that particular crease? Is it bulging upwards, i.e. a fold, as is there too much leather in the shoe, or is proper crease going down. How come that the other shoe does not cause any problems? It is possible that the leather has not been selected well and that there is a fault line (just like the San Andreas fault) in the leather. It is possible that either the leather for the uppers was not carefully selected and matched, or that there is a problem with the lasting (excessive amount of leather). I would take some photographs and contact Allen-Edmonds' customer service.