I see Simmons as a bigger/better version of Evan Turner, and a less talented/less athletic Lebron. Probably makes a bunch of all star games.
As far as his position, I don't think it matters in the short term. The 76ers have about 17 moves that they need to make before settling on a team that they want to make a playoff push with. They are incredibly young and are planning their future on three big pieces that have yet to play a game (Embiid, Saric, Simmons). Both Okafor and Noel have obvious (yet opposite) holes in their game. They are still one of the worst teams in the NBA.
If I were Noel, I would worry more about hitting a 10 foot jumper than handling GM issues. That would be a more effective use of time.