The chart on the left is similar to the chart I developed two years ago for 2012-13 GP / 2013 WCC. It shows the 16 players who competed in the four Grand Prix events, along with the total score accumulated in the three events where they played. Is this the first GP -- for men or women -- where there were no additions to or substractions from the original list of players?
In the 2012-2013 Grand Prix, GM Caruana had the best overall score, but did not qualify for the subsequent Candidates event. In the 2014-2015 Grand Prix, he was one of three players to finish with the best overall score, GM Tomashevsky being the odd man out who failed to qualify. You can look at this in two ways. Either the qualifying process is inherently random -or- the GP scoring adds another dimension to a closely contested series. I'll take the additional dimension.