He is still hitting home runs at a good pace. His HR/F is 16.2%, but his ground ball percentage has risen to 44.4%, compared to 38.5% last year. If this continues he won't see much of a rise in power, it all depends on whether he starts hitting more fly balls.
It's worth noting that he has attempted 12 sb's this year (7 of which have been successful). The Marlins have nothing to lose, and are sending M-Cab a lot.