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Rapid Reaction: Does Andrew Miller's arrival mean David Robertson's departure?

Hello Andrew Miller, goodbye David Robertson? Getty Images

The Yankees have added lefty reliever Andrew Miller on a four-year deal.

What it means: The Yankees could have the strongest -- and tallest -- setup duo in baseball. The 6-foot-7 Miller was as dominant as the 6-foot-8 Dellin Betances this past season. If they repeated their 2014s in tandem, the Yankees could shorten games in a punishing fashion.

However, it could mean: David Robertson is a goner. Before the Miller deal was completed -- for four years and $36 million -- I was told the Yankees could sign both Miller and Robertson.

However, if Miller, a career setup guy with only one-and-a-half standout seasons -- can receive four years, then how does Robertson not ink at least a four-year deal?

Sources have told ESPN the Yankees will not give Robertson "Papelbon money." The feeling in the game is that Robertson will find that elsewhere, which means the man who replaced Mariano Rivera may be getting replaced in the Bronx.

What is most likely: The Yankees believe Miller and Betances both have the tools to close. They were arguably the two best relievers in baseball in 2014, so how could the Yankees not think that?

With that said, if I were to bet, I would put my money on Robertson leaving and Betances and Miller sharing the closer roles, and even working multiple innings on occasion.

Or the Yankees might sign a Jason Grilli-type to work the ninth, while Betances and Miller dominate the sixth through eighth.

Some of the Yankees' logic: Well, by signing Miller, the Yankees will not give up a first-round pick, which is no small thing in their universe. If Robertson leaves, they would pick up a first-rounder.

So a way they can look at it is a comparison of Miller plus a first-rounder versus Robertson. As I explained, when I spent Hal's Money, Miller was really better than Robertson in 2014.

The verdict: I like the move because if the Yankees are going to return to October, they need to be dominant at some facet of the game. When you combine Betances and Miller with Joe Girardi's excellence at handling the pen, this could be the area that sets the Yankees apart from the rest of the AL East.