It seems logical, maybe even the right thing. Unfortunately that will disturb the current undead battle flow and will need further compensation to the undead side. Like increasing they numbers further, or making them stronger. If it would be implemented now the balance could fall imo.
Not necessarily. Even with medium numbers of undead, there is fatigue management to consider and any player holding up a wall may very well elect not to break that wall in order to cut off a head, particularly if it means moving forward/moving one or two brothers into a melee. There would still be a risk/reward element, especially if the ‘kill’ requires 2-4AP.