I think this team has to build an identity with its vets before it will be a healthy environment to introduce the rookies. Without Durant, and with the addition of DB and Green, its an entirely new animal. Everyone's role changes including Book. I expect that the best five players on this team will be Book, Green, Dunn, Brooks, and Williams. But if that doesn't work, they have to figure that out before they can give Fleming or Maluach extended minutes.
I am rather surprised this team is playing as well as it is right now--not because I don't think it has the potential, but because of all the pieces that have to fit together. Really, its a credit to Booker. He is not only the star of this team, he is making it all flow together on offense. He is entering a new level of play.