Bell was the Pirates' hitting coach in 2013, his first year on the job. I was going to mention how he seemed to have struggled on the job, but after looking at the numbers the Pirates showed some improvements in 2013. Here is a look at the 2012/2013 numbers.
Stat - 2012 Ranking / 2013 Ranking
OPS - 25th / 17th
wOBA - 25th / 16th
wRC+ - 26th / 13th
Some of that could have been due to Starling Marte being on the team the entire season. They also had Jordy Mercer at shortstop for half a year, which was an improvement over Clint Barmes for the entire 2012 season. There were some players who struggled, most notably Travis Snider, Garrett Jones, and Jose Tabata up until the last two months of the season.
It's hard to quantify the value of a hitting coach. You can't tell if the improvements from 2...
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