Much less but he doesn't have to. The fact is, it's very difficult to know how good a defender someone like Stones is when his team are so much better than anyone else. Essentially he plays as deep lying midfield playmaker.
Simply won't happen. Stephens might interest an Everton or West Ham but he isn't going to a top 6 team. Dunk's only possible destination is top 6- he'd go for at least double.