In my mind I am amazed that some of the top coaches say that defense wins games. It is important but it is a full court game. You can't have a sound defense without a sound offense. If you aren't sound offensively you cannot play a good defense. You play both ends of the court and you better have a solid offense.
Basketball is an easy game to play but difficult to master.
That is doubly true today. A lot of people can play it well individually. They are nurtured on the playgrounds and summer leagues and individually can be effective players. The important thing is that the individual needs to make the team effective. Does he make the team better with his execution.