Agree that the winners are very strong players. But we have a player who finished second in the World Cup by winning only one classical game.
It’s a great spectator event, but as part of the World Championship cycle, I’m not sure that anyone other than the winner should qualify.
Having said that, I look at the folks who’ve actually qualified and see a strong counterargument…no second-rate players have ever qualfied via the World Cup.
2013: Kramnik, Andreikin
2011: Svidler, Grischuk, Ivanchuk (no complaints there!)
2009: Gelfand
2007: Kamsky
2005: Aronian, Ponomariov, Bacrot (also by rating), Grischuk, Bareev, Gelfand, M. Gurevich, Rublevsky, Kamsky, Carlsen, Malakhov (took Bacrot’s spot). Of this group, Aronian, Grischuk, and Gelfand made it to the eight-player Mexico City world championship.
I don’t like a system that allows a player who won one game, lost one game, and drew fourteen with a classical performance under 2700 to qualify for the Candidates.
While one can win an event and lose rating points in other formats of tournaments (and I’ve seen it happen). I’ve never seen a system other than knockout where it was possible that the second-place finisher scored only 50%, was the 21st seed, and also lost rating points.