Well, we keep talking about Boras, but the general feeling expressed by media has been that Xander was open to a Story-type deal or a little more AT THAT TIME.
And that theory seems credible based on the first extension Xander agreed to.
Once Xander reached free agency and we saw what guys were getting, the concept of any reasonable market value was gone.
The bottom line is, IF they really wanted to keep him, they made a MASSIVE error letting him get to free agency.
That's why I say it makes more sense they didn't want him back.