I think Okore is still a way away. In pre-season he looked very composed but did have tendancy to try his luck on the ball a bit too often and sometimes get himself into trouble. He'll have to be a bit more careful in this league. But he's a young lad with about 3 games under his belt at this level, so we'll ease him in.
It might be fitness, but at this stage, if he's 5th choice, it doesn't surprise me at the moment. Some games we are going to need him though, because he's got a lot of pace. If Hutton were to get injured, it may be worth easing him in at right back. He's played there. He's quick, and he's comfortable on the ball, and if he does fanny around on the ball and get caught out, it may not be as dangerous as if he's in the middle.