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This is being done to protect Rosenstein and the greater anti-Trump resistance.
While the exact reasons for outing Rosenstein are not known at this time [the substantiating documents were available to the Mueller investigation, the FBI and, presumably, to McCabe which clouds the analysis of the exact reason for the action] a report that Rosentein will resign, BEFORE the President can fire him, is designed to paint Rosenstein as a victim of Trump.
Rosenstein - Position - Order - Russia - Collusion
Rosenstein was in a very bad position due to the order to release various Russia Collusion documents, sans redactions. He did sign one of the FISA warrant applications, after all. Also, release of these documents would, potentially, harm Democrat election chances in the midterms. So, he was scrambling to forestall that action, without committing an act which would be prosecutable.
Once he was outed, by the Times, his position became untenable. If he remains an employee of the DOJ, he is subject to an IG investigation and would have to agree to be interviewed by the IG. He would seek to avoid ending up in McCabe’s position. And, Trump has shown an inclination to allow IG investigations to run...
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Goverment, no matter how big, is always a big problem.