If the past universes (A 1&2 and B 1&2) have been destroyed now, and the Mother Grub that will be raised to maturity needs genetic material to begin pumping out new Trolls- will all Universe C Trolls be descendants of the Beta Trolls that made it to Universe C (through ectobiology or otherwise)?

Well presumably, they’d be able to concoct some other color troll dna out of all the blood from the other trolls that’s presumably still tucked away somewhere in the meteor