Woah guys I just had an epiphany.
WHAT IF KARKAT WAS DESTINED TO LEAD THE TROLL RACE IN THE NEW UNIVERSE?
I MEAN IT MAKES SENSE, HE IS THE KNIGHT OF BLOOD!
Think about it, his dancestor, Kankri, is the Seer of Blood, and in the new (scratched) universe, he saw what it was like in the pre-scratched universe.
And considering that the Knight class is about [improving/equipping oneself with their aspect] he can use his knowledge of his own blood and teach them to the new trolls! Since Kanaya did made mention of this, it would make sense it would happen...