Yes and no. What about the players that make a name for themselves after a couple of years down the road this season? Example again is James Harrison.
Also, what if I draft a running back who is solid 80 across the board for his "max potential" on his moves and what naught. That same RB manages to run for 1500 yards 15 td with a 4.5 average. why shouldnt his stats increase some?
I propose that potential be a stat that shows how fast a player can grow. The better they perform and the better their potential the faster we see a superstar out of them. The only thing that should be limited is the physical stats. Exmaples Speed, strenth, acc, throw power, maybe jump ect ect. These should grow some(differeent for each stat) in the early years and thats it.