As Dr F noted, the Marlins weren't players in the Major portion of the Rule 5 draft.
"In this particular year in the Major League phase, we were looking for one of our needs, like we did with Uggla last year," Marlins vice president of player development and scouting Jim Fleming said. "We were looking for bullpen and center field, and we didn't see someone who we thought would be able to step in and do it every day, or even be a bench player."
The Marlins did have their eye on a couple of players but they had already been selected by the time it was their turn to draft. So instead, the team decided to buildup the minor league depth through the Triple-A portion of the draft. The Triple-A draft is less costly and is not as risky.
The Marlins obtained shortstop Josh Labandeira, pitcher Cristhian Martinez and outfielder Lorenzo Scott Jr.
I don't know much, if anything, about the three chosen ones but this tidbit about Labandeira did raise a concern.
Maybe he has been supplementing his income with a part-time job as a truck driver. The Minors don't pay all that much, you know. Or maybe he is so driven that he made one of those indiscretions of youth and now knows better. Who knows, but his behavior bears watching.
If you would like to checkout the BIOs of the players, the Marlinpedia has some of the best ones going.