Who is Wallace from Taft and what is their importance?

Wallace is a former football player who John Nickel hires as a bouncer at Muddy's Over time, it becomes clear that Wallace is personable and sharp, and John makes him a bartender. Over the course of the narrative, John grooms Wallace to become a manager. Wallace figures out that Carl is a drug dealer and assists in clearing the junkies out of the bar. Wallace wrestles the gun from Carl after he shoots John and drives the wounded John to the Woodmoores' and, later, to the doctor's office.