The Marlins opted to go with prospect Marcell Ozuna over uber-prospect Christian Yelich with Giancarlo Stanton on the DL. That's their prerogative.
But as a Fantasy owner, I'd be much more excited if they had gone the Yelich route. Baseball America did rank Ozuna 75th among all prospects coming into the season, but more because of his tools than his production. As a 22-year-old with plate discipline issues who hit only .266 at Class A last year, he's likely to struggle regardless of what kind of start he got off to at Double-A Jacksonville.
He may run into a few home runs just because of his raw power, but ultimately, I think the Marlins will want to swap him out for Yelich, who appeared to be the more major league-ready of the two with a .364 batting average and 1.269 OPS in 44 spring at-bats. And it may happen even before Stanton returns.