I wouldn't argue strenuously against you, either. In some ways, Kramer may have made it possible for Mackey to be Mackey, by showing how an athletic TE could be a legitimate receiving threat. Kramer was a devastating blocker; of course, he was as big as any of the Packer's o-linemen at the time. Mackey wasn't quite as big, but was probably faster and almost impossible for one DB of that time to tackle. Great hands, too; although I remember Kramer as very sure-handed too.