Nightstalker, by and far. His setup will be voidwall, triple jump, black hole, vanish in smoke, courage or light of the pack, courage for an increase to armor and recovery, keeping your team alive longer, or light of the pack, for a crazy amount of supers per event, and he'll go with probably shadestep to keep himself alive. Exotic armor is Sky burners annex, and he could probably use bad juju/zhalo supercell to get his super up faster, with an MG or a sword in his heavy to help skyburners annex proc. He'd want to focus on intellect and discipline, but an argument can be made for swapping discipline out for strength. Now he can lead, defend and buff damage. All three requirements in one solid setup. Have him also focus on recovery and agility. BOOM.