From what I heard part of it was just that Pacheco emerged and he is probably better and cheaper. But, some of it apparently stems from when he was present in college when someone shot a robber while he was present. Apparently it caused PTSD and he has had trouble dealing with it. Some are speculating that being "home" may help him deal with it since he would have family and friends around to help him.
he is the one who shot and killed the guy to save his teammate (and himself). then to top it off, during the Chiefs Superbowl parade last year, someone opened fire in the crowd and CEH shielded a child while it was happening..