My answer is on my previous post:
The AOE damage from the angry pig SHOULD BE a bit higher if his attack is buffed by Boldtusk, costumed Rigard or any other attack buffer than without the said attack buffs.
However, when I tested this, the attack buff made by either BT and costumed Rigard does no increase to Gull’s AOE damage. I tried a scenario where the attack buffer fires first, then Gull, then Gazelle, the AOE damage from the pig has has the same damage as if the attack was not buffed. I also tried a scenario where the pig fires first, then the attack buffer, then Gaz, it yielded the same result.
Conclusion: The pig’s AOE damage can only be based on the attack stat from his level, emblems and troops supporting him. In actual battle, attack buffs from BT and c.Rigard has no effect to his AOE damage. Maybe the boost to the AOE damage requires more than +48% attack. I guess I will experiment later using Wu, Ares and/or Chameleon.
Caveat emptor: this was done in just a few hits.