Rewatch him his first couple of years. He doesn't hardly resemble the same player. Dude can't move. Forget about running.
As I said...fullback-style bodies don't age well, esp when they are playing QB. The dude is a
natural 240 pounds. Thick in his torso no matter what he does. You think exercise is going to change bone structure?
Quarterbacks need to quickly set...and reset. Then set again. Do you think that's easy for a really big, wide-as-a truck guy? You think an athlete, who was never fleet of foot, has had lower leg injuries, and now has mother nature closing in on him...is going to be able to show mobility or run ability?
While I've often defended Dak I was *emphatically not* against extending him. Anatomical-NFL-history was a prime reason. The blame lies with Jerry, not Dak. Dak has always done all he can. Dak will always do all he can. At this point in his career....It just will fail.