Thula and Lucan should be fine right? They survived in the comics and im pretty sure viltrumite can recover from basically anything as long as their brain or heart isnt damaged. I hope they keep it like that, 1.) so we cazn see more from those two and 2.) so we can bloodier fights. Vidor on the other hand is gone, his brain was smashed in and im pretty sure he wasn’t in the comics.
They could go in either direction. Killing them off now keeps comic readers in suspense since we won’t know what’s in store for the smaller characters in the series. Their future roles, if still adapted could also be filled by other, yet to be introduced, Viltrumites fairly easily, since they are pretty minor characters.
That said, Viltrumites (mostly Mark) survive pretty brutal injuries, so it’s also possibly they are alive.
They might also kill one and spare the other, for a little of both.