I haven't looked, but weren't MCW's efficiency numbers terrible in his rookie year? Simmons numbers are solid.
His overall shooting is really inefficient. He shot around 40%. But he was a much better 3 point shooter and Free throw Shooter than Simmons. He also played on a really bad team with bad spacing. But overall they are pretty similar and match up on number comparisons.
I think Simmons is much better but that doesnt mean their numbers dont match up. I also think if Simmons cant learn to shoot outside the paint teams will adjust more and more and make him less and less effective. Unless he switches to PF.