Where was it said that Wall or Invel put all their magic power into etherion or the ice armour?
It doesn't really matter if Dimaria was doing 2 things at once. There's no particular reason to assume the maintaining Age Seal was particularly taxing for her.
Even if Jacob's magic is a hax, it still carries with it a level of magic power. Gemini-Marin was able to counter Transport.
Neinhart's power isn't really hax. He is a molding mage. The historia he summons can have haxed abilities, but Neinhart's magic itself is really no different from Lyon's ice-make creating creatures. They're just more realistic creations.
Invel is not an "attack mage" either. There's no reason to believe that he hits particularly hard. Invel's shtick seems to be just to freeze people, and if that doesn't initially work mind control them with ice slave. Even the armour's main selling point seems to be just to freeze people. We weren't really shown it hitting particularly hard.
Anyways, Wall has more destructive feats than most of the other Spriggans with his regular attacks alone, without even considering etherion. The only Spriggan that comes close to him in terms of sheer AoE is Ajeel, and Ajeel's potency isn't that high. I mean if you believe that all the Spriggan's strongest spells can match Wall's etherion, then how can you be certain that Laxus won't overpower etherion? Laxus overpowered Gajeel's sands of death, which was Ajeel's strongest attack. It was August's opinion that Laxus nuke was going to kill Ajeel. Who is to say that if Laxus hadn't been dying of organ failure that he couldn't have just overpowered Etherion with a nuke?
I agree that not all enraged punches are equal. The enraged punches that Gray used against Natsu would have been stronger than the one he used to break out of Invel's armour. Gray was more emotional and trying to kill, and also he further powered up in his demonized form.
AOE means nothing here
they have equal amount of fuel, if wahl pumps more in his etherion, invel will pump more in his armor. wahl is no way stronger than other springgans
how hax work, we don't know. and I am pretty sure even mishma doesn't know. hax are over powered through plot device most of the time, good example weak heart.
invel isn't attack or defence mage that is correct, but wahl isn't either. wahl attack werent super powerful either, just because they had more aoe means nothing.
this is good a example, sand of death. it was over powered by laxus. but it nowhere near ajeel strongest move. sand world was, even walh etherion will do nothing to it, it will go right through it. these moves wont really interact
who knows. cancer laxus should have been below jura but alas that is mishma for you
gray was trying to overpower something. this is difference than exchanging punches. when you come across a hurdle, you try to exert more force, more mp. this would happen against invel armor. that is why I classify it as strongest power feat from gray in that arc
let me give a hypothetical scenario and ask you a question
nienhart makes a historia wahl. nienhart uses all his mp here, so that historia wahl fires an etherion till a not a molecule is left of historia wahl (historia wahl uses all his mp and then uses his own body to fuel that etherion)
real wahl also fires etherion putting all his mp in it
at the end nienhart and wahl are mp less. which etherion would be stronger?