Crabtree was over-rated last season. All he was asked to do was run basic routes without any of the "reading" required to play against zones and hidden defenses. Reading is only acquired by spending time in the film room and on the field. Today he showed he certainly hasn't put in the film room time and we all know he wasn't in the practice field enough to learn any of the nuances of playing with the big boys.
This isn't an excuse for Smith but when your #1 SuperStar future HOF receiver
isn't running his routes and dropping passes, it tends to make a QB less confident, and that is a lot of what I saw after the mid-point of the second quarter.