What about the D Line, the ones that get the most sacks on the QB. I bet they weigh 50 lbs more on average than they did in tarkenton's time. It was rare, very rare to have any player of 300 lbs, now look how big they are. I looked at the Bills '78 roster, they had one guy weighed 274. Todays roster we have 16 guys that weigh over 300 lbs.