Thanks for posting Euro.
Also at a glance it's interesting to see how many of the recent Gold Cup winners you'd associate with speed, and how many with stamina. Denman and Native River are the only two winners since the turn of the century that you'd class as out and out stayers. Given the suggestion (evidence?) that horses are never quite the same after their win, outside of Kauto Star who was freakishly talented, and Best Mate who arguably ran in three weak Gold Cups, horses that have the right blend of speed and stamina are generally only able to produce that peak performance once in their career. You have to go back to L'escargot in the early 70's to find another dual winner. Two dual winners in 50 years is some stat. A stat that certainly says Al Boum Photo is unlikely to be able to do it again unless it's a particularly weak renewal.
Other things of note are that all ran fairly prominently either at the pace or not far behind it. I don't think any won by picking up the pieces apart from Lord Windermere. I also can't think of another winner this century that wasn't found in the first four or five of the betting. Lord Windemere once again is the outlier. He was also the only Gold Cup winner this century to have not placed all season beforehand. Having said that it was easily the worst Gold Cup field in my lifetime, and hopefully we won't see such dirge again in the showpiece race of the Festival.
So essentially the Gold Cup winner should come form the first five in the betting, usually the first three, it's unlikely to be the previous years winner, but it does happen, and it's far more likely to be a debutante in the race, or one that didn't have a hard race the previous season. See More Business would be a good example having been carried out at half way and then returning the following year to win it.
Taking all those things in to consideration you'd think a shortlist of Santini, Delta Work, Al Boum Photo, and Kemboy should just about cover where this seasons winner will come from.