The reports of his "huge loss" of weight is greatly exaggerated. I even bought into the reports that he had lost 15 pounds. That isn't the case, he said that he only lost about 6 or 7 pounds.
That said, he's seeing the ball well right now. The extra dropped weight has helped him tremendously, you can see that in his swing and hips. He also knows that Feliz is waiting in the wings to take over duties at 3B, which I think explains his motivation to go out and play winter ball and drop some pounds.
I'm not sure how long this will last, but he's delivered thus far in a lineup that sorely needs his bat. He should start to creep his way up into the 3-5 spots in the lineup.