You've probably seen more of Simmons than I have. His lack of a jumper is a bit concerning but there's been plenty of prospects who have corrected problems with their jumper. His form isn't terrible, he just fades and sort of double clutches it, but I believe that can be fixed. His feel for the game is great especially for that age. But the LeBron comparisons just aren't fair, period.
Ingram draws Durant comparisons and those aren't fair either. Both have a chance to be really special, but I don't think either gets to THAT level in the NBA.