Well his dWAR went from a positive 0.8 in 2015, to a positive 0.1 in 2016, to a negative 1.6 last year. So, it looks more like a steady, year to year decline to me, rather than a sudden fluke season. It's been documented in multiple other threads that he lost more than a step last year, for whatever the reason. The awful baserunning numbers would also suggest that his awareness and instincts lag well behind his speed. Which, I assume might also show itself on defense. I'll be interested to see how he does this year, that's for sure.