1.1. Friend, do you understand what you say?
Tired of two swords? These two swords was mere enchantments ... by Irene (!)
August could not kill them.. literally because plot (Natsu negated that magic).
If Natsu had time to eat it, when that magic should have time to affect Lucy and Happy.
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1.2. August "no diff" CS and failed versus Cana cards, right ?
So, Cana alone >>> entire CS ?!
Or maybe just because anyone in CS has holder type of magic,
August was oneshotted with 1st normal attack by prosthetic Gildarts arm...
PoF Erza is PoF Erza. She easily stopped both E.N,D, and DeS Gray arms.
2. Don't you remember DE trio words?
3. If they all on "Acno level", it sounds quite absurd with 25% be able to beat one with 50%. Don't you think so?