Three reasons. First, Jimenez is in low A ball. I don't care how good of a prospect you are that's a big risk. Brinson, on the other hand is major league ready. I don't know anything about Jimenez but I'd take Brinson over him in a heartbeat just because I know for a fact Brinson will play in the major leagues for sure. Second, after Jimenez the rest of the guys the Sox got are kind of meh. Cease is a top 100 guy, true, but he's also in A ball. Big big risk. I believe he has an injury history as well. The Brewers can offer guys just as talented (Ortiz or Burnes for example) who are much closer to the majors. Additionally, the third and fourth pieces can be better quality than the third and fourth pieces the Sox got. Third. The Yankees are said to be the front runners for Gray yet they are reportedly refusing to move their top three or four guys as well. Frazier, Torres, and some others. The A's might eventually get a better offer but I think we can make a reasonable offer without Brinson. In other words, if it was just us negotiating with Oakland I have no doubt they could make a deal without giving up Brinson.