Where did I say I expected them to score more than 5.7 runs per game? I said based on their totals last year, and their career capabilities, I don't think it's unrealistic for them to average around 5.5 runs per game. They might average less, but I do feel, for the reasons mentioned above, that it's a realistic possibility.
As for the defense, I'll address each player one by one. Jeter was average in 2008, and good last year. Based on his start this year, and based on the past two years, I expect his solid defense to continue. In my opinion, Jeter is a very different defensive player now than he was before 2008.
A-Rod is finally healthy, and I think he can contribute an above average year at third base. It's a small sampling, but his range was his downfall last year, and it looks excellent so far this year.
While the numbers suggest Cano was well below average last year, based on watching him play everyday, this is something I disagree with. It's nothing more than a subjective opinion, but I think Cano is average defensively (right now), with the potential to far exceed that.
Swisher was just below average last year, and in the small right field at NYS, I expect similar results. He's hardly spectacular, and he looks foolish at times, but he's hardly a liability out there that some people make him out to be.
Once again, they won't maintain their current level of pitching, just like they won't continue to win seventy five percent of their games. I've said this numerous times already, but I guess it's worth repeating. I've only been making two general points in this debate. The first is that they're not far exceeding their capabilities so far this year. They're exceeding them, just based on their winning percentage, but it's hardly an enormous leap from what they're capable of. The second point is that this team is quite good, and if they stay healthy, they should be a 100 win team, and one of the best in baseball.