I'd love to know why.
As much as Cilic's shortcomings and mental meltdowns against the top guys are highlighted, he has mostly only been losing to them in the biggest events this year. In almost every Slam and M1000 it has taken one of the current top 3 or Del Potro to take him out (in Slams, Delpo in FO, Murray in W and USO, didn't play AO, most recent Masters Nole in Cincy, Fed in Shanghai). In a tournament where the guys qualified for the WTF are bound to skip or tank, you have to fancy his chances.
Yes it was only the top guys in biggest tournaments, because usual a top guy would be the first strong player he would get, majority of his wins this year are players below top 30 or top 40. To win the tournament he'll have to beat at least two top 10 players, I don't see it happening.