I don't watch Tatum often, but when I do, he makes no effort on help defense. None! It's totally small sample size, but I saw this from him on two occasions. Once, he didn't run back after his teammate turned it over and just gave up the dunk. He had an opportunity for a LeBron type of catch up block and didn't even try. Another time a player got by a teammate and he was 2.5 feet away from him in the lane and the guy went up for a layup and Tatum gave zero effort to try to block the shot. It was unlikely, but not impossible, that he would've affected the shot, but the zero effort turned me off. I much prefer Josh Jackson.