Stats would confirm, but not define, a player's contribution.
Stats don't pick up anything of how the players blends with the team. Or better, leads it. Gets the intensity level up.
Same with defense - how can you compare a steal where the ball slips out of the player's hand and gets picked up and run with...verses the defender laying up against the handler, blocking him and then reaching in and picking his pocket...plus laying it in on the other side. Better, when the handler is the other team's best player - deflation, as opposed to inspiration.
The very best is when the game is on the line, and the player bears DOWN and makes something happen. Saves something inside and puts it out there. Changes things, tips it in favor of his team. It's an art that stats don't capture.