The manager? Really? Just about every position player has been out for one reason or another, and the rotation more than the lineup. In fact, ERod, Wright, and Pom (this is actually good in my opinion) are all on the DL right now. Our bullpen has lately been downright scary--to Sox fans, not opposing hitters. And you're going to single out the manager as the one guy who can fix all that by judicious choices on who pitches and when?
I'm not saying Cora is perfect. I was furious when he left Wright in to give up 10 runs, but the Sox won that game. I was mostly OK with leaving Price in when he gave up I think 8 runs, and we lost that game. But overall I think he has made some pretty good decisions all season long and despite those injuries and the slumps and the inconsistencies among the pitchers.
If we don't measure up against the Yankee is the remaining games, I think it will mostly be because of the pitching and especially the rotation. Last 3 at Yankee Stadium, Sale was terrific and Price and I think ERod stunk. That's also what killed us in the last two ALDS's.