Garthanos
Arcadian Knight
I'm sorry but I digress with this, IMHO Fighters are STR based and Barbarians CON based, no doubt, but Rangers are WIS based, Paladins are CHA based (or even MAD based), and Warlords are ANY based or NONE based. That is part of the cool factor of warlords, they can have almost any stat combo and still be usefull.
I don't disagree with your ideas on the warlord (except that I think it has to be a class), but the possibilities are way wider:
Grant damage reduction/parry or a bonus to AC as a reaction
Grant extra attacks.
grant extra reactions
Grant advantage on attacks or even attribute checks
Grant free disengage actions to allies
And that is without even getting the grid involved
Good stuff! And those thinking that somehow making the grid gone makes the Warlord less effective or less iconic just arent getting the possibilities.