Supposing the Red Sox were willing to part with young Will, it seems this would be an opportunity to upgrade offensively while pushing forward the inevitable "Pedro moved to 1st" timetable.
Perhaps: Middlebrooks and Drake Britton in return for Justin Wilson. Wilson is an excellent reliever with potential upside as a starter...but there seem to be no plans to use him in that capacity and Britton could be considered a LHP replacement (albeit a lower quality) in the bullpen. Middlebrooks' potential to be a middle of the lineup power bat could "extend" the Bucs lineup. Inserting him between Cutch, and Pedro has the potential to make all three better. A soon-to-be line up of: Polanco, Mercer, Cutch, Middlebrooks, Pedro, Marte, Martin/Sanchez, Walker would look nice.