I think their basic point was that Campbell wasn't just a great athlete -- he was a great man on and off the field who happened to dominate his sport at different levels, all while playing in the state of Texas.
I don't mean to take anything from Campbell's accomplishments. I'm sure he's a person worth emulating. However, being good at a sport and being a swell guy does not, IMO, put one in the same category as Davy Crockett, Sam Houston, et al.