This really is an amazing quote, and I have no idea what it means. Some points to consider:
1.) J.J. Redick isn't the best white shooter in the NBA. 2.) Gilbert Arenas is neither white nor much of a shooter. 3.) This is sort of like Tom Chambers saying to Larry Nance, "We're the two best black dunkers in the NBA." 4.) Except that this is a lot more like Jon Koncak saying to Larry Nance, "We're the two best black dunkers in the NBA."