Bobby Portis has much in common with Jimmy Butler in that they both endured extremely traumatic circumstances in their formative years. After being deserted by his father at an early age, Butler was actually thrown out of the house by his own mother at age 13. Portis grew up in an extremely bad section of Little Rock, and his mother was abused by a series of boyfriends. Against all odds, both emerged from their childhood experiences as young adults with a burning desire to succeed.
This might be called the "survival of the fittest" syndrome, where the survivors of the most brutal environments are few, but having survived are more likely to perform beyond expectations than the normal individual.
Portis likens his angry intensity to that of Kevin Garnett's. Here's his description of how he mentally prepares for a game:
From MassLive's Jay King:
The conversation started with Portis saying he tries to play with similar passion and energy to Kevin Garnett. A follow-up question came: Are you as crazy as he was on the court?
"I'm very crazy," Portis said. "I play angry. I play mad. I play very angry because every game, I sit in the locker room and I envision that the other player on the team slapped my mom. That's why I get mad, and now I've gotta get you because you slapped my mom."
Remarkably, Portis plays with a controlled intensity. Despite playing an extremely physical style, he has a low personal foul ratio and he makes few of the mistakes one would expect from a high motor player. He was burdened with the responsibility of being Arkansas' team leader as a sophomore and lived up to expectations in every respect.
Portis is downgraded on draft boards because he lacks the above-the-rim athleticism expected of NBA superstars. Another knock on him is that although he is above average in most offensive and defensive skills, he has no exceptional single attribute.
This assessment overlooks the unmeasurable "Jimmy Butler" attribute: the overwhelming drive to ascend from the very bottom of the ladder to the top when the odds suggest impossibility. Everything I read about Bobby Portis suggests he has this intangible asset. While there is a general consensus that Portis will be a solid NBA role player at the very least, I would say there is reason to think he can follow Jimmy Butler's path to stardom.