How deep is your league? I consider Moustakas virtually worthless in shallower leagues personally, so that's a throwaway.
David Robertson is probably of no value this year, barring another injury to Rivera.
So for this year you're trading Cabrera for Davis which is not a good trade, Cabrera is the more reliable across the board good player.
For the future, it's a little closer since you'll probably be getting next year's Yankee closer, but considering Cabrera plays 3B which is not that deep, I would say he is still more valuable to hold.
OBP Mixed 11 Team Roto Redraft
SS N Franklin
UT Rajai D
BN Domonic B
SP - Price, Gonzalez, Iwakuma, Fister, Teheran, Colon, Ryu, Cingrani
RP - Johnson, Grilli, Betancourt