The possible comparison to Draymond Green is this: After he puts on a bit of muscle (I mean, dude’s 18) then you could start him off defending a PF or C, and then in the pick and roll he could switch onto a wing and not get killed. That’s what makes Draymond Green so special on defense. Obviously Bender is taller and leaner, but in terms of “switchability” on defense I think that comparison is valid.
As someone who’s never seen an Israeli league game and has only seen snippets of Bender’s game tape, I think the things that are encouraging about him are that he’s a total gym rat who lives/breathes/eats basketball, and that he apparently is feisty and mentally tough for someone of that age. If that’s the case, you can take a risk on a guy like that knowing that he’s going to work his butt off in the coming years to get stronger and better.