They get the most similar similarity scores on searches for past players. But Simmons is smarter in that he doesnt shoot outside the paint or his percentages would be worse than that. If he played on a garbage team that needed points like MCW they would be the same.
If you run their numbers here are the only comparisons:
https://www.basketball-reference.co...tat=trb_per_g&c4comp=gt&c4val=6.2&order_by=ws
Obviously he isnt in the same conversation scoring wise as Oscar who was almost putting up 2x the points per game. He isnt far off from Magic but he is just as close to MCW. Magic could shoot so I would not really compare those two either. Magic had a jump shot, could shoot the three and makes FTs. That leaves the most similar player. A guy who could not shoot(although MCW still shot because he was on a garbage team) but played good defense, rebounded and dished the ball out well.