Other than those who ran the treatment center that helped Herren turn his life around, the only people mentioned in Unguarded who actually kept Herren from destroying himself were Antonio McDyess and Nick Van Exel, veterans on the Nuggets team that drafted the guard. During training camp, McDyess and Van Exel pulled Herren aside and told him that they knew all about his struggles with addiction, and that he wouldnt be partying at all that season. Every night, he would be checking in with them, and when the Nuggets were on the road, he would be joining them for dinner instead of going out drinking.
And it apparently worked. McDyess and Van Exel did what no coach, no family member, no friend, no mentor had been able to do for Herren: they held him accountable. When the Nuggets sent Herren to the Celtics, that support system was gone and Herren reverted.