I like to think of it as tiers of potential more than individual ratings:
Superstars: KAT, Embiid, Porzingis, Booker (people are sleeping on this kid - can flat out ball)
Perennial All-Stars (5 or more appearances): Jokic, Brown, Mudiay, Russell, Simmons, Turner
All-Stars: Ingram
Of course, not everyone will reach their potential. I think if KAT and Embiid stay healthy, then they'll be superstars pretty much guaranteed. Porzingis and Booker are less of a sure thing, but both of them have top-10 player in the league potential.
The next group is much less certain. I think all of them can be perennial All-Stars with 5 or more selections, though I could also see them all not reaching their potential for one reason or another and only making a couple of All-Star games.
Finally, I think Ingram is clearly the weakest of the bunch. I just don't see his ceiling as anything more than being an All-Star a couple of years. He seems to be Rudy Gay all over again to me.