Kemba Walker’s shooting makes this team sink or swim, simple as that. If the Celtics want to be a Championship team, Kemba needs to be an all star. A real question is with Kemba’s shooting averages all over the place, should he keep shooting? If he stopped, who would replace him? Does he even want to drive to the net or is his knee injury holding him back? Tom Westerholm form Boston.com joins the Celtics Beat.