Cole had alot of bad things going for him.
His metabolism is just like his brother. He tries to put on and maintain weight, but it is incredibly difficult for him. Because of this, he will likely never grow into a LB. While Cole has LB speed, he does not have safety like athleticism.
Sean at least had athleticism with a frame that you could hopefully mold. But even Sean has a hard time maintaining weight which affects his strength, and which is why he gets eaten alive in the run game.
While they have the metabolism we all wish we could have, they don't have one that is cherished by a D1 athlete. But still, at least they have nothing on Beau Davis.