This is so true. We've never seen Tony really afraid of anyone on the Avengers team. He's always been so deflective in the face of danger. Then Steve comes along and Tony trusts him... But not completely, because he doesn't trust anyone without a dark side. Until he sees just how dark Steve becomes and it's all because of Bucky. I wonder if Tony trusts Steve now. To me, it seems like the end of Civil War kind of pointed to that.