You have a definite strength with your rb's but it came at a cost to pretty much all the other positions. You may end up trading one of your 3 rb studs to upgrade qb or wr. Good luck though.
I like Kolb but who knows how he will really turn out. I personally think Binson is trash and winslow is an injury waiting to happen. Your bench is iffy. I'm not sure its a championship you smell
As others have stated, your WR/TE core needs some help. Matthews will help alleviate the deficiency, but not as much as you think. You really have no help on the bench either. I would make some savvy roster moves to shore up the bench towards the end of the season. The key to your championship is Kolb. If he can contribute on a high level he will carry your team to the playoffs. After that it's up to matchups. But remember, Kolb had lots of yardage but 4 TD's and 3 INT's last year. He has also failed to score a TD in the preseason this year. You'll be competitive but make sure you do some roster work to ensure your playoff run.