I'll have to back up my fellow Finnish GM. Since the outside skills are harder to train for a tall guy it's beneficial to have some of them to be modest. I wouldn't want to start with C who has all the main skills very low but there can be a bargain if he has them set up like respectable-average-mediocre. Then you shouldn't worry about those "extras" and you could first concentrate to improve them all to respectable-strong -levels in one season easily. After that it's up to team's needs that what kind of a center the team needs. Obviously I wouldn't buy a C under 6'11'' because otherwise those main skills would be harder to train.