You think Duncan is not that relevant in 07, 13 and 14, and you are talking about good vs. bad posts? I mean, seriously?
Duncan led the Spurs in WS in 07, and was second in 13 and 14, Spurs still center their interior defense around Duncan, and Duncan plays an important part on the offense with his low post scorer, rolls, picks, and passes.
Manu is a fantastic player, but he was never the leader on the Spurs. It has always been, and still is, Duncan. Manu is actually one of my favourite players ever, but he is an X-factor type of player, not a superstar type of player in the NBA. He could have been if you disregard his injury issues, and I am sure he could lead a team deep in the playoffs. That said, he never actually did, he has always been the 2nd or 3rd best team on a championship contender.
AI didn't have low bball IQ, he had a low IQ. The way he break down defenses was phenomenal for a player of that size, and he played very well on the defensive end as well. He dominated a game that were traditionally dominated by giants. Standing barely 6', he led the league in scoring four times and steals 3 times. He finished at a phenomenal rate around the basket, and was feared as a finisher around the league during his prime.
Trying to put Manu or Parker anywhere near the top 50 list is re ed.