Here are the numbers for two pitchers. One of these pitchers is seen as a potential mid-season upgrade for the Pirates, and a guy who could help them for a playoff run. The other pitcher is a guy who is currently in the Pirates' rotation, and who a lot of fans would have as the top candidate to be moved to the bullpen or traded away.

Player A: 3.92 ERA / 4.04 xFIP

Player B: 4.07 ERA / 4.23 xFIP

You can tell by the title that one of these is going to be A.J. Burnett. He's actually Player A. The other player? Edinson Volquez. And the difference between the two? If Volquez had two fewer earned runs, he'd have a better ERA this season than Burnett. The advanced metrics show that the two aren't far off with their performances this year.

There has been some talk about the Pirates pos...

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