I don't get the first two sentences because they seem contradictory.
You're probably right that the original route was just straight upfield. Maybe Cobb was loafing because the play wasn't really designed to go to him. Straight upfield shots rarely are. Cobb misses the read on Brown, but Dak doesn't. Dak stares down Cobb at that point, doesn't see Woods, and throws the INT.
Tough row to hoe for Dak, because he knows the opportunity is with the hot read on Cobb, but Cobb isn't behaving as expected. It's no longer executing reads for Dak at that point, but winging it. Woods is sneaky, sees it all, and hides where Dak's sight is obscured.
-1.5 Cobb Missed initial read and loafed.
-.5 Dak Maybe get more conservative when play design goes snafu.
+2 Woods Recognizes the situation, the proper read, that Cobb doesn't react properly, that he can hide from Dak, and then executes on the INT.