The only position on the bench that's thin is 3B. We've got the best backup catcher in baseball, we've got Brock and Ciriaco competing for the middle infield. We've got Nava, Carp and Overbay competing for first.
No need to call Bradley up to begin the season. We're better off letting him play full time in the minors, at least until we delay his arbitration clock another year.