I think for CF, the Sox will do one of the following:
1) Bring back Bradley
2) Find another cheap defense-oriented CF on the free agent market, with Pillar and Michael Taylor looking like candidates
3) Take back a questionable contract as part of a deal to upgrade the pitching. The first names that comes to mind are Kevin Kiermaier and Ender Inciarte. Other (in my opinion) less likely candidates include Lorenzo Cain, AJ Pollock, Dexter Folwler, Wil Myers, and Randy Grichuk. Two of them (Fowler and Myers) do present question marks about their ability to actually still play CF, which hopefully will be a factor. And it should be one that eliminates Gregory Polanco, who would be a perfect fit due to his bad contract (with one year left at $14.6 mill, which is like $45 mill in Pittsburgh Dollars), strong desire of his team to move him, and abundance of likely available veteran starting pitching.
Polanco is mildly interesting because he was among the league leaders in exit velocity this year, coming in 13th in MLB with a 92.9 mph average exit velocity (which was just a tick behind Devers and his 93mph average exit velocity). But his overall numbers sucked. Like, really bad. Like .539 OPS bad. It doesn't take long to see why - his strikeout numbers are through the roof. So apparently he either hits the tar out of the ball or simply doesn't hit it at all. If he could play great CF, that might be one thing. But he can't, and getting Polanco to play a corner position and moving either Verdugo or Benintedi to CF probably isn't worth it, unless you have much stronger feelings about Joe Musgrove, Jameson Taillon or Trevor Williams than I do. (And i do like Musgrove and Taillon. Williams not so much)...