Why did the Saints get rid of Reggie Bush?

I'm a huge Saints fan, & I'm confused. I don't see why we drafted Mark Ingram. Everyone says that he's going to be Rookie of the Year. He's only going to get 5 touches a game. Chris Ivory & Pierre Thomas are better. Then Sean Payton gets rid of Bush. I know Bush has had injury problems, but when he's healthy, he's a number 1 back. They should have gotten rid of Pierre Thomas instead of Bush. Really, they shouldn't of drafted Mark Ingram. Now the Saints get Darren Sproles? That's too many good runningbacks. They're all going to want money after this season. Chris Ivory is the Saints best back. You have to pay him eventually. You have to pay Ingram. Thomas & Sproles are already paid. Sean Payton is a confusing coach. Also, who wins the Super Bowl this year? & any Falcons fans who answer this, I want to say good luck. May the best team win the N.F.C. South division. It will either be the Saints of Falcons.