I definitely like Sean as the first big off the bench for right now. It gives him an opportunity to observe the game, how opponents are playing, how tightly the game is being officiated, before getting in. That should help him avoid the early foul trouble that has plagued him often as a starter. And it also gives him just the little bit of "edge" or hunger that any player should feel when they spend time anticipating their chance to make a difference on the court. For a young player with so much talent but a less-than-given work ethic, you want to keep them just a little starved so that they eat all of their meal . . . so to speak.
There's no question that he is the most gifted of the Nets' big men, and I include offense in that. The more I see of him, the more confident I am that this guy will have a VERY nice offensive game in a couple of years if he wants to keep working and improving. His touch out to midrange is excellent. He has shown surprisingly good use of his left hand. He already has a variety of releases (jump hooks, banks, jumpers) that look well-controlled with ample backspin. His free throw form looks very good, especially for someone who came in with a reputation of not being a shooter, so he shouldn't be a liability at the line like so many 4s and 5s in the league. And his supreme athleticism will ensure that he will get a lot of opportunities at the rim, either off his own moves or from moving without the ball. I actually think he should be getting a couple more shots a game because he looks so good offensively, plays run specifically for him to get a look.
It's worth pointing out for those unaware that he did not start playing basketball until high school. Usually players with that late a start look no where near as good releasing the ball as he does, especially at this stage in a career. So, again, if he stays committed to work and to improvement, I could easily see him as a 20 ppg player in 3 years and the best offensive player on the team over 6'7".