Is Gabe Kapler Out of His League?

Last week Sternfan1 (He can be followed on Twitter @SternFan10) pointed out that Kapler has made a reputation as a lefty-masher out of epic performance in the Month of June over his career. Normally, I'd dismiss this is a funny coincidence, but PGP proposed that perhaps inter-league play was a factor. It seems worthwhile to look at Kapler's league splits over a larger sample to see if indeed he has an unusually wide league split over his career.

One thought that popped into my mind is that maybe his National League managers used him more efficiently based upon when he had the platoon advantage. Pulling out his platoon usage career numbers based on the league he played in yielded the following:

We know Joe Maddon utilizes platoon splits, but it  held true that Kapler was used more efficiently over his entire career when he played for an American League team. What about Kapler's career inter-league numbers versus each league?

 The tiny sample against the AL is largely useless. However we can see his inter-league numbers when representing the American League (vs. NL) are much more in line with his career performance during his stints in the National League.

Let's go back to SternFan's claim about June and expand the data to May and June, the period in which inter-league play occurs. What if we were to break out American League games and Inter-league play during the months of May and June over the past two season with the Rays:

Those are some pretty silly numbers. Kapler's month of fury was actually quite meek against American League teams.  It does indeed turn out that Kapler may be a lefty masher, with considerable more success if that lefty happens to pitch in the National League.