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I honestly believe it as simple as the "Ownership" not wanting a known cheater. I know, he did the 'crime' and paid his debt to MLB, but our Ownership group wants good citizens. I am not sure why, but if you look at past experience, they got rid of Soriano, Freddy Garcia, The convicted rapist, etc., all because of perceived bad publicity. I think Z got one "get out of jail card" with the convicted rapist but they made him get rid of him. I truly believe they want 'Boy Scouts/Good Citizens' and will never sign any known PED users. (Mistake users (like Morse as a minor leaguer/Choi/etc. are one thing, but purposeful using is another in their eyes.
Of course, I may be all wrong.