But "scoring the points" becomes a lot easier when an excellent coach has installed an effective offensive scheme. You don't need guys who can "make their own shot" or who are excellent athletes or unconscious shooters to score points. All of those things help, obviously, and all things being equal, the team that has those guys will win, but all things AREN'T equal. A good coach can get a team working well together -- setting good screens, moving without the ball, knowing where each other will be, etc. Absolutely a good coach can make a group of average players into a good team.
This also applies to individual players: a good coach can turn an average athlete into a good player, and a good athlete into an excellent player. Anyone who has played pick-up basketball can identify guys who have been "coached" vs guys who just watch basketball on TV and then come out to play. Positioning, anticipation, how to execute a ball fake, footwork, box-out position, etc. are all fundamental techniques and skills that are learned. By teaching those skills, and motivating guys to practice them and USE them, a good coach helps players perform beyond what their "talent" level might normally indicate.