That's what makes guys like Witten and Gonzalez special and HOF worthy. Throw Gates in there as well. They have been consistently productive for a long time. Let's see where Gronk and Graham are in 5 years before we seriously give them any consideration. If they manage to make it to 7000-7500 yds and are still producing at a high level, then we'll see. Vernon Davis has no shot at this point. He'll be lucky to make it to 7000 before he retires. When all is said and done Gonzalez will be somewhere around 15,000 yds and Witten maybe at 11,000, easily #1 and #2 on the all-time list.