Somehow Fairy Tail is the only media where people makes overconvoluted analysis to dismiss ABC logic when nothing in the freaking manga suggests that you should dismiss ABC logic. If character B can beat C but not A then A>B>C, simple like that. But even with spriggans people want to overconvolute when he is not even a hax user, Kirin>RL Laxus>Wall, simple like that. Same logic if Character C can't beat character B but Character A can, A>B>C: Natsu>Wed>Erza don't try to overconvolute when none of them are hax users. Erza can become stronger than Wed in next chapters, but by now she is weaker than both.
Kyria had hypnosis hax, don't try to overconvolute things when there is no hax involved. And Erza used enchantments to match Laxus, he seemed to be able to low diff Base Erza at the time as he one shotted her lightning armor.
I don't even think that DF Natsu was stronger than Gildarts back at Aldoron arc, so yes, there are times.
Fine, in Alvarez context Mashima give 600 to Natsu without buffs
https://i.ibb.co/d7XPdDL/20240502-031935.jpg And 500 to Cobra
https://i.ibb.co/Kz9Fgqy/20240502-032004.jpg Even now current Cobra can just extreme diff Blade while Natsu one shotted two spriggans. The gap between them wouldn't be justified with these numbers unless this is just Base Natsu and not FDKM Natsu, as Alvarez Base Natsu should be even weaker than Jacob.
And of course there is this
I'm based on feats and logic to say that protagonist buffs are not temporary. What's your basis ? Your wish of Erza being stronger ?