Barnett didn't play last week so that helped drive up Sweat's snap count. This said, I like Sweat and have him as a sneaky DL3 play in 10-12 leagues this week. If he continues to perform, he should be able to carve out a nice role for himself.
I picked up Sweat last week when Barnett was injured and he rewarded me with a decent game. However, I believe Barnett is back this week and that will somewhat limit Sweat's playing time - although he will be in the rotation and I think the Eagles come back against the Rams after last week's debacle.