Nobody should be leading an army in WvW unless they have the capacity to perform ALL of the duties of the commander.
That is to say, the ability to fight with the troops is lacking at level 11. Nobody can take more than a hit or two from a level 80 character, let alone fell one at that low of a level.
Even if that person has another level 80 character and plenty of experience as a commander, they shouldn’t be leading any armies with an under-geared character.