There actually is some validity and accuracy to what the article said:
KB does have some weaknesses in his game....his lack of elite speed and long stride will limit some things that he can do. He does not posess the speed to get a lot of separation in the NFL (like Megatron, Julio Jones, etc do).
With his size, strenght, and hand size....he has the ability to become a fantastic posession receiver. But, to really get the most out of him, he needs to be paired with a WR corps that has some speed on the outside (let them stretch the field and open up the middle and sidelines more for KB). If we do that, I really see him as an Anquan Boldin kind of player (but maybe even better).
Here is to hoping that the Panthers add that weapon in the WR corps to truly maximize what they have in KB.