If Embiid had the exact same freshman season, stayed in school, broke his foot, and redshirted his sophomore and junior seasons before coming to the NBA, where would he be taken in this year's draft? Because that's a pretty simple way to evaluate his value in terms of picks.
I'm pretty sure it wouldn't be #3. Or even #16 for that matter.
Regardless of what potential he may have had two years ago, he's not worth much to anyone except Philly at this point.