Any Molecular biologists out there care to comment on whether the initial test releases that were done should eventually snowball anyway, or if they put in some kind of automatic generational die-off in the sequences?

My understanding of the Gene Drive was that it acted like a sort of super-dominant alele, with all subsequent progeny expressing the new trait. Not sure how that can be out back in the bottle after it gets out, just a matter of the number of generations it will take to go fully up the hockey stick.