Due to the poor keep design (double outer doors), the most effective way to capture the keep is to send one or more assassins over the wall to kill the commander in the tower. The commander is orange to 39, An unclaimed keep commander can be soloed by an assassin (it has happened multiple times), a lvl 4 keep commander can be killed either by 2 assassins or 1 assassin and a healer stood behind the tower keep using AoE group heals. Is this working as intended? I believe the commander needs to be at least red to 39 even for the unclaimed version.