But you know that the Natsu who defeat Animus was pre Alvarez?
Natsu was shocked/afraid of the MP from Brandish, Ajeel, August.
He never used the power from Igneel against Animus, like he did against Zeref in round 1.
He never used the special flames against Animus from his battle against FH Zeref
So I do believe that some of the S12 have the MP of a dragon part they can't hurt them (without ds magic) so only, August, Irene and God Serena could do it.
But imo it's useless anyway, because Mashima will always write what he wants, if he wants, he can write how Kinana defeats 1 dragon.
It's all mashimas fault again, he either didn't want that they use their hax, so that team Natsu can win easier or they can't use it anymore because they are not part of Viernes anymore.
But what ever the reason was, it was bs and proves again that it's useless because authors don't care about power levels.
Probably the best thing would be to compare feats like destructions feats or how someone can manipulate the environment.
Battle feats are useless, because it will always be different. In the next battle someone like Romeo will defeat Haku.