Is Irby's injury Colt's fault?

I was at the game and I thought it then and after I saw the video I still think Colt made the wrong read and Irby's knee paid the price. If you look at the video you'll see that the left tight end was wide open a level behind Irby. McCoy hung him out there for the kill shot.

http://www.youtube.com/watch?v=seZtmjbvZYQ

yeah, he hung him out to

yeah, he hung him out to dry, but you can't say it's all colt's fault. that's ridiculous. if the DB hit irby up high, we aren't having this conversation.

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