Many of the powers that grant Int or Cha based bonuses only do so if you chose the appropriate Presence option at level 1. It's entirely possible to do a warlord with only two attributes, but Str is always one of them.
"We're more of the Charisma, Strength, and Intelligence school. Well, we can do you Strength and Charisma without the Intelligence, and we can do you Strength and Intelligence without the Charisma, and we can do you all three concurrent or consecutive. But we can't give you Charisma and Intelligence without the Strength. Strength is compulsory. They're all Strength, you see."