This will be Green's sixth full season in the League. So, I'm going to start by looking at Pierce's stats in his sixth full season in the League (on a Cs team bounced in the first round of the playoffs).
I believe Ainge thinks the Cs can develop Green into a Pierce-type all-around player by the time the rebuild is complete and the Cs are ready to contend.
Pierce (Year 6): 39mpg, 23ppg, 6.5rpg, 5apg, .402 FG%, .299 3PT%...
Green (Career Avg.): 32mpg, 13.6ppg, 5.2rpg, 1.6apg, .449 FG%, .345 3PT%...
I think Green can increase his scoring with increased shots, but I think the team will be looking for him to maintain his efficiency, as well. It will be tough considering how often he'll be looked upon to create and score.
I also think they'll push Green to increase his rebounds and assists. He'll obviously be playing more minutes, so he'll have to find a way to maintain energy, which I don't think will be a problem.
Green (2013-14 Predition): 37mpg, 18.5ppg, 6.5rpg, 2.5asp, .445 FG%, .333 3PT%.
I'm looking for Green to take a step forward as a team leader.