Jimmy Butler went from being picked late in the first round to an all-star in 4 years.
Davis wasn't even the number one recruit at the beginning of his freshman season. In fact, just a couple years before he was in the NBA, he was a 6'2'' point guard.
Damian Lillard went from a nothing prospect to an All-star.
Ingram was mostly not considered to be the 2nd best player in this draft because of how quickly he has developed through his senior year of high school and freshman year of college.
Its ignorant to expect every player to dominate every step of their development. Bird did. Lebron James did. Duncan did. Shaq did. Melo did.
Garnett did not. Kobe did not.
Paul George didn't exactly dominate against WAC competition at Fresno State. Kawhi Leonard did not dominate against MWC competition at San Diego State. Russell Westbrook struggled in college.
Your argumentation is flawed, especially considering the fact that Bender is younger than many of those guys when they came into the league.
You don't expect a freshman in high school to dominate the varsity basketball team. You look at his potential and how he faired against players his age. Then you develop his game so he can be a dominate player as a senior.
That's Bender. Is there potential? The size and fluidity says his athleticism isn't going to hold him back. His play against guys his age has been great. He has shown the ability to shoot, pass, and defend at a high level. The IQ and work ethic is there to add more to his game. But he is still a JV player. I don't expect him to dominate against the varsity level yet. But that is what he has been playing against.