When this doctrine is used (I do it over Mad Dread) and you upgrade the Killa Kans with scrap, they don't get a shield when reaching 5 rockets (unupgraded it works).
Not a bug but quite annoying: When you command 3+ Killa Kans to Rocket Refill, only 2 do it, the rest just stands around.
And the Auto-Targeting of Killa Kans is also bad. Its a unit with limited projectiles. If you command more Killa Kans via A-Move to attack, they all attack the same target and do a huge overkill on that particular unit, leaving them useless against the rest of the enemy forces. As if I don't have to micro anything else as orc player, am I really supposed to manually target my Killa Kans? (the whole target prioritizing of this game is not good. But for Killa Kans its extra bad)