Oddly enough, it's Omar's holdovers Harvey and Familia who are currently struggling. Wheeler has looked pretty good.
And the pitching the current regime brought in during the draft last year is doing very well, especially the college guys who could move pretty quickly through the system: Mazzoni, Verrett, Leathersich and Panteliodis.
Free agency is a tough game to play, and there are a lot of misses. It's just not a balanced way to build a team. And with more and more teams locking up younger players this year (McCutchen in Pittsburgh, Gio Gonzalez in DC, Cain and Bumgarner in SF, Votto and Phillips in Cincy, Kendrick and soon Aybar w/ the LAA, a handful of Royals and Indians, and even a guy like Niese, etc.), fewer players will be hitting free agency in their primes. It's going to be less of a viable option.