So according to WGN/Kaplan Barrett was traded because Lou wanted him gone. Also, according to them couple of weeks ago Barrett walked into Lou's office and asked if he can close the door so they can talk. Barrett then told him that a lot of players are aware that they have been playing poorly and that it's their fault mostly for loosing, but that players are also getting angry/upset that Lou is not taking any responsibility. Lou didn't think he is responsible and that was the end of conversation. That was also the last straw in Barrett's tenure with Cubs.