Agreed with the others, I'd rather not trade Jack at this point, he's looking promising.
EDIT: to his credit, Ferraro does look like a leftie Jared Spurgeon (smaller but capable, mobile and puck-moving defenseman) and he is their top LD, so there's reason to think maybe THEY don't do it either (we love Jack's upside, they need Ferraro defensively). Major point aside, Nieto also doesn't meet a need (we have many wingers -- Di Giuseppe, Gadjovich, Motte, Highmore, MacEwen, Lockwood, and we're well stocked for forwards in general) so I'd rather see if we could get someone like their RD Meloche (project RD but big and physical at 6'3", 210 lb. and decent offensively in the AHL too).