Wes Unseld was not a particularly tall center at 6'7", but he was an immovable object in the paint area like Joshua Smith is now.
Legendary center Wes Unseld was known for his build of granite and picture-perfect passes that led to a Hall of Fame career. Former Georgetown Hoya standout Joshua Smith is far from a finished product, but his sheer physical mass and immovability make him an intriguing prospect built along the lines of Unseld.
Just as Hassan Whiteside took years to become a legitimate NBA prospect (and he may still need more time to establish a credible product), Smith needs time and patience in order to build the utter will power to conquer his physical fitness demons.