Did you think that it was going to be someone else? The Fish's closer is really the only trade piece that is going to bring back anything of value in trade. Relief pitchers are always in demand and he was the best one in the game last season. He led all relievers in the Majors with a 3.6 WAR. Even this season, he already has a solid 2.3 WAR.
It's important to point out that he was significantly better last season. He had a 2.31 ERA/2.17 FIP, with 12.0 K/9 and 2.8 BB/9, in 74 games and 78.0 innings pitched. He had 12 saves along the way as well. This season, he has a 1.50 ERA/3.69 FIP, with 9.5 K/9 and 5.8 BB/9 in 35 games and 78.0 innings pitched.
Tanner Scott is already gaining interest from multiple teams and that means that some decent, if not quite elite prospects can be had for him in return. I'm definitely excited to see what the Miami Marlins get in return for this upcoming free agent. If you're wondering who will close games in his place, it will most likely be a good old committee. Let's hope that The Fish get the best possible return for these players.