There doesn’t need to be a change of will or anything massive for Clive to get massively stronger in a fight. It’s like how he goes from losing to base benedikta to beating her semi primed form to beating Garuda in the span of a day.
He doesn't get stronger at all, he's just as strong at the start of his fight with Benedickta as he is at the end of it (We're never shown or even have any implication that he gets stronger during that fight until he absorbs Garuda's essence after he beats her), then he gets that amp after absorbing a portion of Garudas essence and ultimately while he holds his own pretty well he needs to transform into Ifrit to beat Garuda straight up.
I didn’t explain why it’s consistent above. When ifrit took the gigaflare to the face he was out for a while, have we forgotten eikon’s have regen? He by no means scales to it nor can he yank it and like I said before, if bahamut lands a gigaflare in game it’s an instant death.
Yeah but he didn't even need to regen from it, Garuda could rip his arm off despite being a little bit weaker yet apparently an attack that is literally 1,000 times stronger than Ifrit doesn't do anything besides knock him down for a while? Besides, Eikons regen isn't that insane, they can regen limbs and stuff but a beam that completely engulfs Ifrits body would've done way more damage that he'd be able to regenerate from if it was actually 1,000 times higher than his durability.
Yeah but it dealing instant death doesn't require it to be 1,000 times stronger, especially since he's already noticeably superior to Ifrit and in cutscenes we see Ifrit being durable enough to withstand a Gigaflare without losing limbs, dying, or hell even being forced back to Clive (It's possible to force Eikons to turn back to their dominants through sheer power or damage, and unless you wanna argue Ramuh or Odin are 1,000 times stonger than Ifrit was when they forced him back or that they also have a multipler of 1,000 times for their attacks to Clive than I ain't seeing how Bahamuts Gigaflare would be that much higher than Bahamuts normal spells.
The gigaflare being able to damage ifrit risen is literally inconsistent in game as we literally see Phoenix and ifrit (not fused) synergize to create a force field that tanks the Tera flare which should be >>> giga flare.
Did you forget that Bahamut is amped to a massive degree during his fight with Ifrit Risen? His Gigaflares are way above his base forms Teraflares given that even a quick uncharged beam from him casually shattered the same barrier he couldn't breach with a Teraflare in base form. And given that Ifrit Risen is superior to amped Bahamut while base Ifrit and Phonix are inferior to base Bahamut it's not inconsist he can handle gigaflares, hell him plowing through the Zettaflare shows it's not inconsistent to handle Gigaflares.
That analogy is heavily flawed cuz in this case there’s a direct multiplier in its name. A gigaflare literally means a thousand mega flares.
That's not a direct multiplier it's just a name to show superiorty, saying that Gigaflare is literally 1,000 times stronger than Megaflare because that's often used in real life is not great reason (Esspecially since, like I mentioned, lesser flares can harm people who can withstand higher flares). Hell Clive can use Gigaflare when he aquires Bahamuts powers yet in fights with Barnabas or Ultima it doesn't one shot them despite Clive being able to harm them with Megaflare or normal attacks. There's just not a whole lot to justify the names of these spells being an exact one to one multiplier like in real life.