Sexton is trying to develop, that we know of. He is studying film with Conley and Hardy, and obviously Hardy is putting him in those positions which indicates that he wants to learn.
However the more I think about this, the more I think its a lost cause. Sexton is a tunnel vision guy, and its how his brains are wired. Its easy to see between people in general, that some of us are observers and thinkers who are wired to plan while others are doers who are wired to act. You need both types on the court, but a good playmaker must be an observer. He must be the guy who sees and records everything, even stuff going on in his peripheral vision.
Now if we would move on from JC at any point, Sexton would have a place in this roster. However he would be a downgrade. But as long as JC is in, Sexton is a 20 minute maximum guy for us. As I have also stated on numerous occasions, Sexton and JC cannot be on the court together for extended periods of time. It just stalls our game. We need 1 guy like that, and I would prefer JC right now even if he is older.