snowbreaker

It could be a nose tweak, but I'd be shocked if it's just a random coincidence. A lot of things previously thought to be extremely difficult/almost impossible are happening, and I think some sort of Rosharan exodus is being hinted at, so I wouldn't be surprised if they are Skybreakers.

They could be but seems a bit more significant to me. First, they are Ghostblood agents. Then, the dialogue around legality - "You are certain this is legal? The mass sinking of private ships?" Steris dismisses them because, well, why wouldn't she. But we know better.

IDK seems implied in chapter 70 that some skybreakers are on Scadrial - the 8 'allomancers' that fly away to sink the ships after checking the legality of it with the governor. So I'm team Roshar here.