What happened to Denard Span's power?

Kenny Karst-USA TODAY SportsWhen the Giants signed him, they were probably expecting a little more pop

Over the offseason, the Giants declined Nori Aoki's option and instead ended up signing Denard Span. And while Aoki's been awful this year, and the only reason I'm bringing him up is so you don't feel too bad about Span, Span has himself been a low-key not very good player. Giants fans everywhere have noticed that his defense hasn't been much better than average, and his hitting has been a disappointment.. Specifically, hitting-wise, he has shown absolutely no power after a career of thoroughly adequate power. What gives?

The first thing to note is that while this would be Span's worst…