Some of my co-workers and I had a debate throughout the day about whether the 1972 Miami Dolphins (or any other team from 40 years or so ago) could compete in the NFL today. I say no, saying the size difference will be two much to overcome. That isn't to say that some of those guys weren't big (Csonka would be a big RB right now) but overall the size difference would wear them down and eventually the modern teams would take control. I'd say the average player is faster now as well. The argument against it seemed to state over and over that size and strength aren't everything. That's very true but it was if the guys were acting like no modern NFL player has any skills at all, they're simply strong and big. That's obviously not the reality. Again, I don't see how they could compete for an entire game giving up so much size, especially by today's NFL rules.