The Huntsmen gain the strength of those in their "pack" who have died.
They're still berserk killer-mans. So what if they go from the strength of 6 berserk killer-mans to one berserk killer-mans? That's still a fit, trained, dangerous berserker in the basement.
Plus, how do thresholds interact with Kool-aid man wall attacks? Does it stop counting as a house after X damage?