I'm a CC fan. He's as tough as they come. But he's a RB that would rather run over people than run around them. Because of that type of running style, his body takes a lot of punishment which is exactly why we see him missing time on occasion.
Carson is only 26 years old, but because of the pounding he takes, he likely has a body of a RB years older. Because of this, I'm not sure how much he has left in the tank, and the only way I would extend him is if it's on a very team friendly contract for 1-3 years max. If he's looking for top 5 RB money, I would just have to tell him, "thank you for being a great Seahawk, and I wish you all the best."
Even if he was worth top 5 RB money, we can't afford to pay him that when we have so many other holes to fill on both the OL and DL, secondary, and depth at WR and LB. And we need to do that with a cap that is almost certainly going to be lower than it was this year. JS is going to have his hands full for sure. Will be very interesting to see how he handles it.
Of course that's going to leave us with a big hole at RB, but I guess I'm in the minority in believing that Penny can be a featured back based on what he was doing before he got hurt. And he's shown flashes in other games as well, but has never gotten the amount of carries that a RB needs in order to get into a rhythm. More importantly, they need to learn how to use him properly. He's not a CC ground and pound type of back.
I agree with others that Dallas and Homer are nothing more than situational role players. But just like they did with Hyde this year, they can either resign him, or find someone similar on a reasonable contract to rotate with Penny at a cost much lower than it would take to resign Carson. And with a lower cap, there should be plenty of them out there to choose from.