Ik some people might feel like I betrayed them so here is a hug
there is, like, no way August is soloing the entire FT guild.
I won't really give August powers he doesn't have so speculating that he has time stop or something else is out of the question IMO.
I'll use whatever he has now.
all you need to do is send Gildarts, Cana and Lucy at him who can use their magic via magical items.
Gildarts can hold off August like he did before.
since August hasn't shown any great piercing resistance, Erza would just slash him bad with her OP swords (not normal knife sword like what Brandish used) in the middle of his fight with Gildarts.
btw, August can't copy multiple magics at once (like 20 in this case LMAO).
he only copies one at the time so if everyone cast their attacks at the same time, he'll nullify only one.
plus, there is no restriction on PoF and Makarov is killed so FT gets 100% increased damage and this is not a joke.
second round, Natsu wins.
peak PoF Natsu burned away Fairy Heart and hit Zeref so hard he couldn't even regenerate properly.
FH >>>>> August
FH Zeref (should be) >>>> August
his nullification won't help him here.
maybe I hate August too much or my different perspective I took to read FT (I even reread some parts of the last 3 arcs of the original manga) is affecting me.
most likely the latter.