One important aspect of the Warlords is that they kick in if the toon heals on their own turn. They do not grant buffs if the toon heals during an allies turn.

If KP casts bloodlust on his turn... he's not healing then. If an ally then strikes aand the bloodlust heals.. it's still not KP's turn. So no Warlord buffs.

You're better off equipping a set of self-healing talismans such as Sustaining, Greed, or Vampire in conjunction with the Warlord set. That way he'll always heal on his turn.. and gain Warlord buffs.

Most upper-level PvP Teams run him with Warloard and Sustaining.