It is never about only one thing, but it is often a top priority for any head coach with options: 

Is there a quarterback I can work with and win with? 

John Harbaugh contemplated that for several days as he considered which NFL outpost to next inhabit. He interviewed Wednesday with the Giants and is on the verge of becoming the 21st head coach in franchise history, the Post has learned. The Giants, Titans and Falcons were the three top contestants in this reality game. 

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Given that Harbaugh is 63, he was not going anywhere to start from scratch and take on a total rebuild.