she seems to have a problem killing her brothers when they're in front of her, but not with putting out contracts on them (remember when she had people bringing her dwarf heads?)

I'm not really sure why Varys thinks Jon would turn on Dany (other than bad writing, because Varys isn't that dumb). Like, even if he got him to do it, why would Jon ever trust Varys after that?

I don't think he'll turn Tyrion this late in the game, but I'm also not sold on Dany's inevitable heel turn. I think it's a tease.