As we also saw, Paolo and Nikki were all about themselves, so if they thought they could do something to save themselves (like talk to someone on a walkie-talkie) it would be easy to assume they would do it.  They killed a guy before they got the island, i think it's pretty much safe to assume they would do anything.

Yes, I agree Rara. I think they would have sold anyone down the river if they think it would benefit them.