Beta heaven has representations of them, meaning they're just shy of being their real selves, not Natsu.
Natsu would have soul resistance for being E.N.D.
It was set up and establishment of something against a non-major character to more than likely be used again against a major opponent...
You don't seem to understand what a measuring stick character is.
It's not an asspull. Introducing something in a fight with a measuring stick character. That's why they exist.
Stop reading FT if you have such a problem with it.
Wraith had soul powers.
Zeref had soul powers
We know Zeref made Natsu specifically to counter him, which is why he could move even with time stopped since he'd need to to contend Zeref's time stop.
We're still early in the 100YQ, only at the 2nd Dragon God and who knows what beyond the...
Naw, probably more of something he'll have to work on.
Also no. An asspull would be if the occurrence was something that drastically shifted the story. A character like Wraith who just showed up are the perfect people to reveal new powers on instead of it happening during a major fight like...
There's no proof he did use it.
Gray being afraid of Mira is the same reason Natsu is afraid of Erza despite being able to 1 shot her the second he drops Dragon Force.
It's how they see the people, doesn't change the fact who's superior to who.