If I were Danny, I would find a way to unload Hayward rather than Rozier.
Just watched that Denver game on NBA TV. That rotation of Rozier-Baynes-Morris-Smart-Brown played great in the 1st half, and had a big lead going with their defense and running game. They looked like the old Celtics. They had a double digit lead. When the first team came in, with Hayward, Horford, Irving, Tatum and somebody, the lead melted to nothing by the end of the half.
To win the Celtics have to RUN. And Rozier is part of that running game. I'm not saying Hayward is useless, or that he won't get better in time, but I think he would be better off with another team. He slows down the running game, and he is a step slow on defense.
Danny has a real dilemma here. Seems like he signed Hayward centuries ago, and a lot of water has gone under the dam since. Plus the connection with Stevens.
The future Celtics core looks like Brown, Tatum and Rozier to me, and trading him would weaken the team.