I kinda think Simmons is built more like a Draymond-type super-roleplayer than a heliocentric star like Tatum or Embiid. A glue guy, defender, facilitator, rebounder, but you don't want to put the scoring burden on him. He has a lot of value, especially on the right team, but I don't see him as a top 15-20 player like Tatum, nor do I see him ever threatening for that status unless his game evolves.