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It's logical to think that 2015 was the outlier unless Martin continues to hit like that all of 2016.
That being said, it's also possible that during 2015, he picked up some bad habits which could take awhile to iron out. If that's the case, he would probably improve but not enough to produce like he did before.
It feels like people want to discount what the defensive metrics say about Martin. I agree that they don't always get things correct but Martin has been around a few years and all metrics seem to like his defense. I'm fairly confident that his defense makes up for having a relatively poor bat.