If Sullinger and KO can come in next season in much better shape, then drafting Gordon at 7 or 8 and have him play sf will workout.
Gordon is an excellent individual and team defender. He has enough quickness to even guard SG.
On top of this, why it could work is that, Gordon will take his man (sf) closer to the rim on the offensive end and have a size, above the rim play advantage vs most nba sf. KO will be on top of the three pt line and sullinger also can play around the perimeter at times. KO and Sullinger are also able to hit the jump shot on the consistent basis which will hide Gordons issue (inconsistent jump shot).
on the defensive end, Gordon will be everywhere on the court and especially able to be that 3rd PF to help out Sully and KO under the rim. Finally some rim protection capability will be nice to have
It will be an unorthodox setup, but could work