(This is another in a series of 30 guest columns that will run in October, when optimism reigns supreme across the NBA. The theme will be “Five Reasons to Feel Positive About … ” We encourage you to follow the authors on Twitter and visit their sites. – CS) For the Cleveland Cavaliers, rock bottom came on January 11, 2011. On that night, already entrenched in what would become a league-record 26-game losing streak, they were demolished 112-57 by the Los