By Bill Esdaile ONCE AGAIN we were second guessing the weather last week, and while the predicted rain arrived at Haydock, none of our fancies showed up on the ground. We live and learn, and we’ll have to do so quickly, as attention turns to Saturday’s Derby (4.30pm). It looks like one of the hardest renewals to decipher in quite some time, partly due to the deluge of rain Epsom has experienced in the past week. The track has had around 20 millimetres in the last seven days and there is even more rain forecast this week. A soft ground Derby is surely not what City Of Troy, the current 3/1 favo…