The one thing we can't forget about KO is his background...He was a PG, until around his junior season in high school, before he had a seven-inch growth spurt out of nowhere. Because of that growth spurt, he was criticized during his early years at Gonzaga for being too slender and not "banging around" enough down low. So, he's only been used to his current body (after he put on weight as a 'Zag) for about two or three years....and, that's counting his first year in the NBA. This is someone who had to completely reconfigure himself as a basketball player and has done so, improving during every step. Every time he's gotten more minutes, no matter the level, he's improved...His first with the Celtics was only the latest example.
As far as his defense, no one should ever expect him to be a rim protecting beast. However, his BBIQ is so high, that he should be at least an average defender within the next two years. He will beat guys to spots because he'll read the rotations, he'll know when to help and he'll adjust to how the NBA game is called. Smarts wasn't what I questioned about him defensively when he came in; it was aggression and his desire to get "dirty" in the paint. I saw improvements in both of those areas throughout the year.
I'm not saying Olynyk is the next big thing...I'm not sure his ceiling can even be specified yet....What I am saying is this: KO is a legit 7', with legit 3 point NBA range, has a unique/skilled offensive post game, who is extremely basketball smart/savy, who improved his tenacity and rebounding through his first 82...If he can work on his game on the defensive side and keep up his conditioning, he's a starting stretch-4 in this league.
And that, with the 13th pick in a down draft, I'll take every day of the week and twice on Sunday.