Until he walks to his dressing room, Anthony Njokuani is a guy getting better all the time. He’s made peace with his family. He’s getting respect as a mixed martial artist. He smiles a lot.Then, backstage, he thinks about his childhood. “The Assassin” emerges.Njokuani, 29, is an up-and-comer in the WEC lightweight division. Guided by his idol, Anderson Silva, the six-foot native Nigerian stumbled in his debut against contender Ben Henderson, but racked up two straight victories in subsequent appearances this year.