That right there proves to me you either don't watch the games, or you can't properly scout and asses a player therefore I have no reason to continue this discussion with someone who doesn't know what he is talking about. Fuller has developed into a very good route runner, which makes teams actually have to play him letting his speed get the best of them. It's very easy to defend a receiver who can only run down the field fast, a lot harder to defend a guy who can run down the field fast, and runs crisp routes so he can break them off and make you pay for just playing the deep ball.
DT has been drawing every team he has faced top corner this year, but yea I guess teams don't have to account for him