The Chicago Cubs are likely to be trade deadline buyers this summer, and the pitching staff is going to be the focus of Jed Hoyer and the front office.There's been significant focus on the starting rotation being the top need for the Cubs this summer, and for good reason. Edward Cabrera, Jameson Taillon, and Ben Brown are injured, and Justin Steele and Cade Horton are done for the year.However, MLB.com's Jordan Bastian made the case for why the bullpen should be the team's top need this summer. Instead of another starter, the Cubs should pursue a late-inning reliever by the August 3 deadline.Why Cubs should pursue a reliever over a starter at trade deadline"Chicago's need for rotation help is clear, but the front office shouldn't overlook the bullpen at the deadline," Bastian writes. "...