He was traded because he had enough value to get Unger in return. Don't forget, Payton had originally offered Kenny Stills for Unger, but Seattle demanded Graham. But, yes, Graham was soft, but Fleener isn't looking any tougher and appears to have issues catching the ball. Graham has also supposedly worked on improving his blocking skills. The little I saw he did actually engage more often than he did in his time with the Saints. Seattle just never used him to his strengths. For the right price he could be a huge upgrade.