NBA Notes: Mavericks, Naji Marshall, Nets, D’Angelo Russell, Darryn Peterson, Jazz

Mavericks There’s plenty of talk about Kyrie Irving and Cooper Flagg heading into the season, and rightfully so. They’re the Mavericks’ anchors. But Naji Marshall sounds as if he believes he can be an X-factor — particularly from the perimeter. “Nothing but net threes. That’s it, gonna make me unstoppable,” Marshall told reporters at media day. “I truly believe that. I worked very hard on that. So, I’m not gonna surprise me, but I might surprise some of you guys.” Dallas signed Marshall to a three-year, $51.8 million contract extension this summer, so they clearly believe in him. Can he…