Why did Luke Ball leave St Kilda?

As you've heard from ball himself that he felt unwanted but there was so much talent in the saints crew that they all of a sudden shined over him..He was once the clubs favourite son...but times changed ..he changed...Ball saw another opportunity, Collingwood, although we have an already solid midfiled, Collingwood appreciated him and as all football clubs do with their new recruits, make him feel welcomed. Collingwood need more experience with all the young blokes around, and Ball needed a new place to call home.