If you see my original comment to the thread, I was only stating that actually killing Alucard would be basically impossible because let’s face it, any kind of phasing in and out of reality ability is utterly broken (I’m looking at you, Obito). That’s literally the only point I’ve been trying to make this entire time, and people keep missing it. The entire scenario simply wouldn’t work because one opponent can literally choose to just not die, hell, what would happen if Alucard chose to exist within Dante, Antman in Thanos style, it’s ridiculous.

As for Dante’s lifespan, he’s clearly ageing, he’s part human after all. And if rebellion or Yamato would work on Alucard is interesting to think about, not entirely sure if they’d work considering Alucard isn’t a demon/devil