yep.I believe some 1 mentioned it would in theory be possible for a warlord to have 2 barracks if facing another warlord and using conquer.
Isnt it that you have to control that zone so if you had there two goblin grunts and enemy one adramelech, you control that zone thus can cast Conquer?
The zone can have enemy creatures in it when you cast Conquer, as long as they are Pests or incapacitated.