My worry with Bender is a huge lack of atheltism. He has a 27" vertical which is on par with Sulley.
Keep in mind, as with the oft-reported '216 lb' weight, that his 27.5" vertical number comes from a measurement taken a full calendar year ago at Eurocamp 2015, when he was just 17 years old. He's very visibly put on more weight over the last year and DraftExpress has listed him at 225 for quite some time (I think that is his official weight per Maccabi FOX Tel Aviv's roster guide, which would probably be from last Fall).
There is a very high probability that his physical numbers (ht, wingspan, wt, verticals), if measured now, would be significantly different than they were a year ago. And again, if measured a year FROM now. These kids are still loaded with growth hormone and changing rapidly.
FWIW, DeMarcus Cousins vertical at age 19 was also 27.5". I wouldn't worry too much about that particular number.
I'm not sure if Prozingis didn't have the season that he did last year that Bender would be so high.
One can also not be sure that if Justice Winslow didn't have the nice season he had, that Jalen Brown would be ranked so high. Or if Steph Curry had not just rained 3PT bombs on everyone's heads all season, that Hield & Murray would be ranked so high.
FWIW: Bender has been highly touted on scouting reports and on early 2016 mock draft boards for several seasons now, going back to his age 16 dominance in the U18 Euroleague Tournament, well before Porzingis became the next great NY Knick.