I didn't forget Jim Thorpe. He would have to be the Most Versatile Athlete of All Time, and arguably the Greatest All around Athlete Of All Time. He was an Olympian, a Professional Football/Baseball/Basketball Player. Sticking strictly to Football though, he didn't play at quite as many positions. His playing time.was from 100 years ago.
Red Grange " The Galloping Ghost" would be another player to consider but again, not to the same extent. He dates back 100 years ago as well.