[Spoiler] Saul Durand is the only character...

>! to never put on the VR headset. Could it be the reason why Sophon can't mess with his brain as it did with Auggie Salazar, Vera Ye or Thomas Wade? Hence Trisolarians inability to display any countdown or giving him any suicidal thoughts? Or I'm missing something? Because why would they go through all this trouble to try to kill him when they could just make him throw himself off a cliff like Vera Ye?