Ingram just turned 19 a couple months ago (almost two years younger than Jalen Adams, remarkably), so it makes little sense to cap the potential of a kid that gifted. Not saying he's over-matched or can't contribute at this level as a 19-year-old (though his stats would indicate that might be true), but in a perfect world, he's still playing in college right now. He's literally a kid playing against grown men and man is he built like a kid.
The Durant comparisons were always a bit silly, IMO. Durant posted 25, 7, and 3 on 48/42/86 splits at age 20. He's a generational player and I think Ingram is more than one level below that. I think he's closer to Otto Porter.