By Chris Mannix The Celtics enshrined Russell’s No. 6 among those that will never be worn again. The NBA should do the same BOSTON – For 13 years Bill Russell terrorized opponents on the court, collecting 12 All-Star nods, five MVP awards and 11 NBA championships. For his efforts, the Celtics enshrined Russell’s No. 6 among those that will never be worn again. The NBA should do the same. William Felton Russell died Sunday. He was 88. He died less than two months after Stephen Curry picked up his first Finals MVP—an award that is named in Russell’s honor. The NBA has done much to honor Russell’…