It’s now or never for Deron Williams to prove he is worthy of being the $100 million face of the Brooklyn Nets. Is Williams still an elite point guard? Is he a winner? Or is he the reason his coaches are sent packing and his teams don’t quite measure up? Despite a blockbuster trade to acquire Kevin Garnett and Paul Pierce, who have championship rings and 25 combined All-Star selections, it is Williams who holds the key to Brooklyn’s title hopes. Consider this: Brooklyn