I was thinking the warlock would be the best chassis for a new warlord class.  Means the warlord would have a couple of major abilities per short rest (like the warlock's spells) and a list of maneuvers/tactics known (like the warlock's invocations).  It would mean finding level equivalent tactics for the warlock's invocations, but that's fine.  I'd  add medium armor to the warlord, however.