I wouldn't label KMart as having great defensive ability, and as far as that defense down low was not their problem. It was trying to stop DWade. Kmart played well in the Finals in NJ where he was on a team that pushed the ball and found him on the break, on a team like that he was really good, but in Denver where they do not play that way he has done nothing and it would be the same in Big D.
Dallas can play whatever way they want, I thought that much was evident in the playoffs. They went from playing slow and grind out with San Antonio, to beating Pheonix at their own fast pace running game. Kenyon can thrive if he's not asked to be an option on offense. The thing about Denver, and why it went wrong, is that most of those players are playing for themselves instead of a team system.