If that's the case, why can't Minato just power null literally any one he fights? I believe it is NLF to assume it can do anything else (even though I assume he would have something for other people's powers). However, again, Prevasion is technology based, Minato lives in a time where the most advanced piece of technology is like... a radio... communicators? And that's in Shippuden, Minato comes from an age at least two decades ago. I absolutely disagree with the idea that Minato has ability to seal things NOT ONLY for other's powers, but TECHNOLOGY that comes from the far future of our own world. He likely wouldn't even know how it works to even make an attempt, especially with something primarily specialized in Sealing Spirits, the exact opposite of technology
We don't assume Gilgamesh can teleport just because he should have a Noble Phantasm that does that, or the ability to manipulate vectors because he should have a Noble Phantasm to do that.
Stamina
That's true, but healing can still offset that advantage anyways, plus, I still argue that Gunvolt's Stamina is still comparable to the point where it won't make all that much a difference, especially healing. As well, while Chakra is a limited resource all Ninja must keep track of, Gunvolt's Septimal Power is completely psychic and rechargeable. The more Jutsu Minato uses, the more Chakra and Stamina he drains. And we can all agree that if Minato runs out of Chakra, he's done. Meanwhile, all of Gunvolt's abilities are more mental, not physical, which means that theoretically he can keep using his powers. (After all, he can recharge his EP, Electro Psycho Energy through concentration alone, yes, that's how he charges EP). As well, GV didn't show any signs of tiring either in his stamina feat, just like Minato.
This isn’t even taking into account Blade’s Feats, who uses Gunvolt’s powers (yes, they can be scaled to each other, Gunvolt states that the Azure Striker Septima grants him a boost in physical capabilities, and Blade was a normal human before she got her Septima, it’s pretty clear that without the Septima Blade wouldn’t have the stamina feat I’m going to mention now). Blade was continously having her Septima go berserk for at least several days as she was non stop searching for her target, no breaks at all.
As well, in the gap between GV1 and GV2 (half a year I believe), Gunvolt was CONSTANTLY on the move to get away from Sumeragi, which is a company that effectively rules the entire nation and overthrowed the nation’s actual government a long time ago. Now I don’t think he was doing it straight, but he can’t afford to rest for long at all.