What's bizarre about this isn't that it's a bad route. He just stops. It looks like a comeback, but it's not really because he just stops. Now, if he'd stopped after he knew the pass was already made to Witten, that's one thing. There's no reason to keep running the route after the pass has been made. But I don't see how he can really tell the pass has already been made by the time he stops. He had to know beforehand that he wasn't getting the ball.
If that's the case, then what he did is fine -- sort of. He did run hard to begin the route, so as not to tip the hand that he was far down the list of reads for Tony (my guess is he was the 4th read on this route at best, with Witten and TO being 1 and 2, regardless of order, and the dumpoff being the 3rd read). But the reason he gets the "sort of" is that he needs to realize Tony is going to improvise a good bit and he needs to keep trying to get open even if he's the 4th read.
In summary, I guess, is that the route wasn't the problem -- the problem was him just standing there after he ran his "decoy" route.