I just do not believe that Bender is light years ahead of Porzingis. If he was, 1) he'd be playing in actual games; 2) he'd be producing in actual games; and 3) he'd be in strong consideration for the #1 overall pick.
The key qualifying statement is at the same age. Givony said Bender was light years ahead of where Porzingis was at the same age. Since Porzingis came out at 19 he's not comparing Bender to Porzingis the year Porzingis was drafted but the year before.
When Porzingis was 18 he thought about coming out but decided to stay in europe because he couldn't receive a lottery promise. What Givony says makes more sense if you compare Bender to the guy who couldn't get a promise in the lottery, then went back to Europe, improved and became a top 3 pick.
What I find most interesting about Bender is the potential I see in him. His fluidity of movement is of the type that you rarely see from 7 footers. Combine his fluidity with his length, reports of his motor/toughness and that's a player who I think has a world of potential.
Since I see the Celtics as having a competitive advantage developing prospects due to coaching, having an established system and a quality locker room I want to see Boston select the highest upside prospect available. Outside of Ingram/Simmons I don't see a prospect with more upside than Bender.