Matt Duffy did have a .762 OPS last year with SF, but I do not think he's all that great. Lucious Fox was the big prospect involved , IMO. I found this on baseball Prospectus:
2. Lucius Fox, SS
DOB: 07/02/1997
Height/Weight: 6’1” 175 lbs.
Bats/Throws: S/R
Drafted/Acquired: Signed July 2015 out of the Bahamas for $6 million
Previous Ranking(s): Not Applicable
2015 Stats: N/A
Future Tools: 70 speed, 55 hit
Role: 50—Average regular up the middle
Fox, who played high-school ball in Florida, likely would have been a top-20 pick in last year’s draft had he not been declared an International Free Agent in April, a ruling that earned him an extra $4 million or so. He oozes athleticism and has a swing that works from both sides of the plate, staying through the zone with quick wrists and very little wasted movement. There’s more power from his natural right side at this point, which will probably change as he gets stronger; still, anything more than 40 power is unlikely because of his size/swing plane. The approach as a Florida prep left a lot to be desired, though there’s plenty of time for that to develop.
He has the speed and arm strength to stick at shortstop, but plenty of scouts I spoke with believe his ultimate landing spot is center field. The Giants will give him every chance to stay in the infield, and if he can he’s a potential .280/.350/.400 player who can steal 40 bases.