Garthanos
Arcadian Knight
Secondary roles are fine, of course.
You suggested having a small unit of men for volleys and such to aid the controller role (that seems it would utterly dominate the build), but I was thinking more of knocking the leader angle to secondary by replacing this primary leader power with something less potent and changing other presences and such to ones which enhance other controllerish abilities akin to the Mages enchanter abilities.
I was considering something along the lines of a last second warning encounter power.
Last Second Warning :
While you are less about inspiring allies than other Warlords you never the less are eminently aware of enemy actions and keeping allies aware and hale is very much an advantage to the team.
Trigger ally within 10 squares would be hit by an enemy attack.
Free Action: Ally gains benefit as though the Warlord performed an aid defense action; This may be selected after damage has been rolled for.
While it still has a leader cast to it, I think this would be more subdued.