Well, can't say I followed Darvish once he got traded, but pretty sure he had an excellent performance against the Cubs, so in theory, he did help them get to the World Series. Granderson clearly wasn't effective since they opted him off the World Series roster. Then again, you have to take into consideration why they were getting Granderson and what their expectations were of him. But I get your point.
Clearly, the biggest trade was the Verlander one which paid off big time. Without Verlander, I don't think the Astros get by the Yankees.