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"“I received an explanation regarding Ryuuteimaru. That is — it looks like Ryuuteimaru holds a power capable enough to destroy a planet."[—!!? A p-planet!?] Everyone except for Ravel and me screamed in shock at Rias's words. This was natural, right? You know, if you heard this and that about a planet. I said,“Even when I defeated Tartarus, Seekvaira-san told me to suppress the power. In fact, with limited output, it had such power, right? ...I also thought it was dangerous. Destroying a planet sounds crazy, but I feel like I understand.”Using that power inside Ryuuteimaru, I realized. It's scary in a different sense than True Dragon Deification. True Dragon Deification was scary because of the risk of the body not being able to adapt, but [A×A] with Ryuuteimaru was too scary because, on the contrary, the risk was low.“—The current Ryuuteimaru, [A×A], is too dangerous. ”I said so.“Have your feelings for oppai finally reached planet-breaking levels...? ”Xenovia said with a groan. Rossweisse-san asked with a serious expression." ....So a restriction in order to be able to unleash that power when you think about doing it, right? " I said.“Currently, it’s not quite at a perfect state, so I don’t know how serious it can get... But if I have it shoot at high power, I think it will be able to shoot. That’s why it’s dangerous.”Supposing it can fire an attack powerful enough to be able to break the planet... there’s no way you could shoot something like that easily. Because it would all be over.— "I just woke up and this thread is already have 8 pages...
But now, I agree for cosmology being low multiverse, but for character itself... disagree, for now. Also did Issei just tell Ddraig blantantly that he died if he blow up the planet?
"[However, if you destroy the entire planet, you win.] I'm also going to die if the Earth is gone, aren’t I!?"
Lets break this down, the first quote says a few important things. First, Issei can destroy a planet. Second, it can be done with limited output (meaning while holding back). Third, Issei says the power is scary and it would be difficult to shoot higher output blasts with AxA because he would die but they'd still fire. And lastly, Issei will die if the earth is gone.
We also know that if the planet were to be destroyed, all of the gods would die too as their existence is tied to human's belief in them.
So Issei's durability doesn't scale to max power AxA attacks but it does to limited output attacks. (Backed up by Issei being able to use these same limited output attacks while in AxA) I covered how strong planet busting in DxD is here https://vsbattles.fandom.com/wiki/User_blog:MasqueTLDF/DxD_Cosmology#Human_Realm the last statement could mean a plethora of things, like Issei not having food in space, the devil and angel's population dying out and the stronger residents of earth as well meaning that threats like ExE would be able to destroy them easily.
Especially given Issei can survive the force of his normal AxA attacks, Issei not being able to survive the destruction of the Earth is very unlikely.
Also, Issei is fine without oxygen, he's been in the Dimensional Gap multiple times.