Kelly Olynyk to me is a perfect example of a young athlete today who is talented enough to be a star but he isn't. He seems so content with just learning and going through the motions right now. Maybe a light or something will light a spark under him someday but he plays the game without that mentality. He's 7 feet, can shoot and has all the tools to be a very good player but plays the game so passively. he is lacking that mindset of a guy like brady.
To be honest, I think it's more an issue with his physical ability then anything.
Kelly is a seven footer who is pretty mobile laterally and who runs the floor very well - but he just doesn't the physical tools to gain an advantage on a nightly bases. He doesn't have the type of explosive quickness to beat guys off the dribble at will. He doesn't have the leaping ability to jump over guys. Doesn't have the physical strength to push guys around down low and force his way into position. Doesn't have the length to shoot over guys in the paint.
He also doesn't have the quickest release on his shot - he's quite a methodical shooter, it takes him time to get set, elevate, and release. Because of this, he actually needs quite a bit of space to get his shot off, and that leads to him lacking the confidence to shoot it a lot of the time if he sees a defending closing out on him.
He'll often have good games when he's up against guys who are really slow footed and immobile defensively, as he can use his agility and ball handling to get by them and get to the basket. Likewise he can score inside against much smaller guys if he has a mismatch. Also if he is up against a team that doesn't close out on shooters well/quickly, then he can really heat up and hurt you from three.
Problem is that he really depends on those specific matchup scenarios tin order to contribute heavily on offence. On defence he is much more consistent - not dominant by any means, but he plays hard, doesn't give up on plays, contests everything, moves and switches well, always finds himself in the right place. Even holds his own in the post sometimes against dominate offensive players by getting good position and forcing his opponent into uncomfortable shots.
My fear with Dragan Bender is that when I see him play, I pretty much see all of what I just described in him too. I can see him, much like Olynyk, struggling against average NBA competition. I feel like he's going to be the type of guy who is only going to be able to dominate when he's got very specific matchups that he can manipulate and take advantage of.
I think Olynyk is good enough to be a full time starter, but only if he is playing in the right type of rotation. If you have a dominant big man (Dwight Howard, Demarcus Cousins, etc) who can draw a ton of attention from the defence, then that could give a guy like Olynyk the type of space he needs to be a very dangerous role player. He could be really deadly in the right situation.