Cooney played defense at the top of the zone as good as anybody and didn't make many stupid mistakes. Cooney's limitation was his talent. Kaleb and Roberson have talent limitations, too, but they compounded them with a combination of poor effort, poor decision making, and a lack of balls. Cooney had effort, balls, and at least average decision making abilities, he just wouldn't get his threes to go down all the time.
I don't know Jim Boeheim personally, but I'd bet he's more okay with a greenlight shooter missing 3's than his PG turning the ball over if somebody looks at him crosseyed and his rebounding power forward with great size, athleticism, and strength not being able to rebound, defend, or score when he's a foot away from the rim.