EDT September 26, 2013LeBron James is on top of the NBA. Can anyone knock him off?(Photo: Steve Mitchell, USA TODAY Sports)Story HighlightsFirst set of NBA media days comes with hype for several contenders who want to challenge Miami Heat13 new coaches and eight new general managers take over, marking unprecedented change in NBAInjuries to stars such as Kobe Bryant, Russell Westbrook, Rajon Rondo