Well, at some point talent becomes a factor. Centro has not shown that he has the physical tools necessary to run as fast as a guy like Kiprop, who has run 3:27. With that kind of speed, a guy like Kiprop doesn't even need to execute a tactically flawless race to win. He just needs to avoid a disaster and the gold is his.
Grabbing silver was indeed further evidence that Matthew Centrowitz is one of the most saavy championship racers in American history. Compare his championship track record to a guy like Alan Webb who has run 1:43/3:30/3:46. In 2007, Alan Webb went into the WCs ranked #1. Dude was on fire. He could have won gold. He SHOULD have at least won a medal. But instead, he did what Alan Webb always did. Buckled under the pressure. Matthew Centrowitz has ice in his veins and competes like he's supposed to be there.