yankees have some bullpen depth even without Robertson. Adding Wilson helps. They have McCann and some depth at catcher, so this was a decent move. I don't know what their plan is for the middle infield, but Gardner and Ellsbury are a very nice combo for that stadium. The problem they have is fighting the far end of the aging curve. They'll get good use out of Ellsbury and Gardner, but year after year, they have to hope that Tex, A-Rod, Beltran, even McCann stay healthy, Kuroda doesn't skip town, and CC bounces back some. If Beltran could play the OF, then you could DH A-Rod, bring Headley back and just go with gloves in the middle infield.
Robertson to the Tigers and Soriano to the yankees (to mentor/ set up Betances) makes some sense.