I'm not really good at this stuff, but I'm taking a stab anyway.
The chart is ranked by wRC+ and includes all the players currently on the Rays' roster. Ruggiano only has a little over 50 plate appearances, but he's certainly raked during them.
Anyway, the chart is pretty straightforward and doesn't spell out anything all that crazy, but it does put Briggy's struggles into somewhat sharp relief. And man, even with his recent slide, that Joyce guy is pretty good.