Grey's Anatomy Season 9 Speculation: How Will Mark's Departure Affect Derek?

As many fans know, Grey's Anatomy Season 9 is going to start off with yet another loss: Mark is leaving. Although we don't know whether he dies or leaves for another reason, we're sure his departure will rock Seattle Grace-Mercy West to the core. One person we expect will be especially affected is his BFF, Derek (Patrick Dempsey). But what will the effect be? Here are a few theories about how Mark’s departure might change Derek. It might push him closer to his family. We expect to see...


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