[HoneyBadger]

You can do a Deathshape for the night goblin, BandarLover, and also make it a Shapechange option, so that the night goblin doesn't *have* to be hidden in the weaker unit (some tactics might work better with the night goblin having an immediate presence on the battlefield.).

The concept could be quite an exciting one, if developed fully enough. Surprises on the battlefield were common enough, historically. Multiple units with various applications might be spawned from a single, lookalike, "seed" unit, via Deathform. (One might possibly even be able to juice an entire Nation's basic theme from the concept...). It would be fun to witness how the game's AI handles it, and how players might plan for such, through the direction of that AI.

For the squabbling: Berserk might have some application there. Isn't there a form of Berserk in the game that, when triggered, causes units to lash out at the closest enemy, including their own side? There are Neutral units, too.

Also, possibly very low Morale in general, with the addition of lots of cheap, low Banner units, so that the accidental/incidental elimination of those Banners could cause the Greenskin army to cave in upon itself.