Well, it doesn't prevent you from getting it or transmitting it, but it can help some people avoid serious complications. So, yes, in those cases it helped save lives.
And, last I checked, he didn't sign any of the present bullpen arms at the beginning of the season either. Bottom line, if he's "too good" to prevent it now, was he not "too good" to prevent it early on?
Well, it's really not a vaccination, more of a treatment. It doesn't prevent you from getting it, it doesn't prevent you from spreading it and how many other vaccinations do you know of that you need to get a booster shot every 6 months or so?
I disagree, the seizing of defeat from the jaws of victory can sometimes have a more negative effect on the team's psyche. But in the end all losses count the same.
Certainly not a Yankee skill. But I don't attribute errors on the other team's behalf as being lucky either. And I disagree that the Yanks have any more luck than other teams. Over the course of a season every team will have some breaks that fall their way and times when they fall the other way. It's baseball.