He is a PF.
When I visualize KO as a center, pictures of Andrea Bargnani trying to defend comes to my mind.
Not sure this is a fair comparison, given that Bargnani has long since stopped trying to defend. He's more apathetic than ineffective.
Yeah, Bargnani had the physical tools to be a good defensive center. He just thought defending and rebounding were a waste of time for a player of his talent. His job was to score the ball and that a player of his talents shouldn't have to waste his energy as a defender and rebounder. 'That is what other players are for' or something along those lines. Guys like Reggie Evans (rebounding) and so forth. His job was to score. Rest of it was somebody else's problem.
Bargnani actually said this in one of the interviews on Raptors team website and when the team realized what he had actually said they pulled down the interview straight away. Like a striker in football (soccer). That was his mentality. His job to score. Everyone else's job to do defense and rebounding. So long as he scored, he had done his job well. Up to rest of players and coach to find solution to defense + rebounding. Not him.
And then Bryan Colangelo goes and makes things even worse by firing the only coach (Sam Mitchell) that was trying to force Bargnani to play defense to earn more playing time and instills Jay Triano who was ordered to play Bargnani 30+mpg no matter how bad his defense and rebounding was. Compounding all of Bargnani's worst habits. Awful team management from front office new coach Triano.
Bargnani could have been a good defender. He had good physical tools (much better than Olynyk). Bargnani was strong, had good size and solid length. Mediocre lateral quickness and leaping ability made it hard for him to be high level shot-blocker & overall defensive center ... but he had enough physical talent to be a good defensive C if he applied himself. There would be (rare) glimpses of that talent -- post defense on Dwight Howard or PnR defense and switches on Nash / Frye or how hard it was to shoot over his length when he tried to block shots. When Bargnani actually tried, he showed he could do good things. Bargnani just didn't bloody well try. Thought it was beneath him (the #1 pick and top scoring threat) to do the dirty work. What a waste.