G5 replaced G4 as Luffy's ultimate form. It is far better and the drawback isn't nearly as bad.
Because G4 is no longer Luffy's ultimate form, he uses it for short intervals with little to no consequence. Meaning that G4 basically replaced G2/G3 as Luffy's go to gear.
Because G4 is so strong, almost every low tier will get destroyed by it.
If Luffy encounters anyone that is strong enough to pressure G4, then he would go to G5. As if G4 is struggling, obviously G2/G3 wouldn't help.
This basically makes it to where he has no reason to go to G2/G3 unless he is either fighting absolute fodder, or its a situation like the seraphim where G4 gets stalled by its durability, but it isn't necessarily threatening enough to warrant G5.
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Some of you deserve this.
But Kizaru won't fall in this arc from what we have seen.
He will. He is the arc antagonist.
If Kizaru disobeys Saturn, he fucks his career. If Luffy loses, then Vegapunk and the SHs are screwed.
The only scenario where everyone wins is if Luffy beats Kizaru. That way Kizaru doesn't need to betray saturn but he also doesn't need to kill vegapunk. The only person who loses here is saturn, but fuck him.