Now, D-Hall is a testament to the fact that if you put your mind to it, you really can improve that aspect of your game. But D-Hall is also an example of someone who had bad habits and bad technique at Virginia Tech that have continued through his 9 years in the league. When he was younger, his speed hid some of those defencies, but as he got older and the league caught on to him, those weaknesses started to get taken advantage of.
Again, he's improved a lot more than people give him credit for. But it's been 9 years, and he still gets has bouts of bad footwork, and he still gets his hips turned in the wrong direction, and he (though not as much as people think) still occasionally jumps a route on a double move because he's not minding his work. He's a lot better. I mean A LOT better than he was with the Raiders, or even when he first came to the 'Skins. But when it all breaks down, you resort to what you know.
You can teach technique, and tackling, and what have you, but for the most part, guys are going to be who the are. Worst yet, Amerson reminds me of all the worst qualities of D-Hall, only slower than D-Hall was than he was his age. He ran a 4.4 officially.
People get caught up in the physical attributes of payers and they ignore the film. That's the same mistake coaches and general managers make. Al Davis made a career out of that. Even Mike Shanahan has fallen prone to that.