Its logically impossible and ill explain why.
First of all,we all know the best ability to read moves lies within the sharingan. A not only did he state it on multiple occasions but we cleary saw how he ran circles against sasuke. We also know that A's lightning armor increases his reflex synapsis so much, he was able to see and dodge amateratsu, an instantaneous attack. Now with that in mind, this could only mean one of 2 things:
1.KM mode has to enhance narutos reflexes and visual perception to that of a level even greater that the mangekyo sharingan. Now i know A>B>C logic doesnt work well,but this case is an exception. While i believe naruto has the speed to dodge it, I dont think he has the perceptive abilites or reflexes to see it coming.
2.Plot hole.
The 4th is an exception because it was stated that he had top tier reflexes....he also had a T/S jutsu which we know beats any speed jutsu.
In the three times A attacked Sasuke, Minato, and Naruto; there is a very brief pause between the moment A arrives in front of his opponent and the moment where he strikes.
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In that short pause, Naruto had the reaction speed and the bodily speed to dodge A.
In that short pause, Minato had the reaction speed to activate FTG and dodge A. (He also flicked a Kunai up, then dodged the first time he dodged him)
The key is the short pause that A makes when he attacks right before he hits his target cause during the pause he is right in front of the target's face.