@uberhikari: You must had forgot that Itachi was able to keep up with Naruto in clock mode one, who is faster than sonic speed when he was fighting A ( Raikage). And he was handling both Naruto and Killer Bee by himself for a while....And he match Naruto speed. Luffy weakness is fire. Him and Whitebeard can be consume by Itachi Amaterasu for seven days and seven nights. Itachi would find a way to hit them with it. Plus he doesn't have to keep up with them. They have to break through his Susanoo which I don't see since his shield can block anything and that would risk them being hit by his sword. Although I don't know if it would sealed them or not.