And if the Sox can add two SP's, Houck is not likely to even be in the opening day rotation.
So if Soxprpsects.com is right, and the Sox add 2 SPs (Kluber and Odorizzi) and only 1 RP (Colome, who is the only name they are connected to to date?), and a 2B (C Hernandez?), a CF (tough call, since none of them ever played for Tampa), and a LHH bench bat (sticking with Brad Miller here) then yes, the Sox could certanly be competitive.
A bullpen with Colome(?), Barnes, Brasier, Hernandez, Houck, Taylor, Andreise, Whitlock and Valdez is actually not awful.
Especially since you absolutely know that Bloom is going to sign Ryne Stanek at some point. Might even get him on a MiLB deal, since he has been so ineffective since joining Miami. For all of 31 IP....