The successful courtship of Duce Robinson gives USC head coach Lincoln Riley the chance to work with a field-stretching tight end and incorporate him into his loaded Trojan offense. The fast downfield receivers, the bruising running backs, the change-of-pace Swiss Army knives catching passes out of the backfield, the Heisman Trophy quarterback — USC already has so many weapons to deploy. A dynamic tight end is another elite piece which increases options for the Men of Troy and their play-designing head coach, who doubles as offensive coordinator. We will have to wait and see, but Riley might have his best…