[Omnikaiser]

hum...
O. Kay.
I always thought Ace was very old. The Caesar coin, him mentioning Plato and an old japanese general. i always had the feeling Ace met them himself somehow and he was old enough to know the Roman Empire.

But straight saying he joined DGP on AD1. It's literally the birth year of Jesus and with all the "God" theme of the show + Ace being tied with thorns in the opening, I guess there's a theme.

Not saying Ace is literally Jesus Christ or even "God" himself (I don't expect Toei to go deep into that territory). But still. The choice of year is peculiar and can't be a coincidence.
But Ace being a martyr, suffering for other people in the world to be okay, is probably a thing.