Without knowing his personality and mental game, I see Simmons as one of the most talented and athletic players in the NBA. He has the real potential to be an MVP on the right team. He could put up 20-12-12 numbers with high level defense in the right situation.
Fwiw, Embiid missed 9 straight games in January 2020. In those 9 games, Simmons averaged 21.6 points (on 65.3% from the floor), 9.3 rebounds, 7.9 assists, 3 turnovers, 2.3 steals and 0.3 blocks.
In the 17 games (including game 3 of the 1st round) he played without Embiid last season, he averaged 20.9/10.3/7.5 along with 1.8 steals and 1.2 blocks on 55.3% from the field.
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On second thought, why not use Simmons as a Point Center? I mean, can you guys think of a Center that he wouldn't be able to defend in today's game? Maybe strong players like Drummond, but who cares? If your #1 strategy is to feed Drummond in the low post, that's a recipe for disaster.
DefensePG: Smart
SG: Brown
SF: Hayward
PF: Tatum
C: Simmons
OffensePG: Simmons
PG: Smart (secondary creator who mostly plays off the ball)
SG: Brown
SF: Hayward
PF: Tatum
C: Nobody, but I could see Simmons setting picks whenever he's off the ball and then rolling to the basket. Would love to watch the Smart-Simmons pick n roll!
It could work, assuming that Smart maintaines his shooting form from the perimeter (36.4% last season, 34.8% this season). If not, we'd probably have to replace him with a PG who's a deadly shooter and is happy to play off the ball. Let's say someone in the mold of McCollum, Brogdon, Beverley, prime George Hill (off the top of my head). Wanamaker fits the description as well, but he ain't good enough to be a starter.
Forgive me if I'm wrong but I think Richardson is a free agent this off-season too. We'll see how the salary cap works out, but I find it unlikely that Philly will retain him considering the dearth of free agents out there and the money that some teams have. He might be a nice fit next to Trae Young, for example.
He has a guaranteed contract for next season and a player option for the season after that.
2019-2020: $10,116,576
2020-2021: $10,865,952
2021-2022: $11,615,328 (player option)
Btw, I'm a fan of Richardson's game. Would love to see him in green someday. He's a very useful role player.